Annual report pursuant to Section 13 and 15(d)

Short-term Financing (Narrative) (Details)

v3.19.2
Short-term Financing (Narrative) (Details)
$ in Millions
12 Months Ended
Jun. 01, 2019
USD ($)
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Aug. 17, 2017
USD ($)
loan
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member]        
Financing [Line Items]        
Amounts outstanding   $ 0.0 $ 0.0  
Amount borrowed   $ 483.0 $ 700.0  
Number of days borrowed   95 days 22 days  
Weighted-average interest rate   3.64% 4.27%  
Weighted-average amount borrowed   $ 387.7 $ 319.1  
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member]        
Financing [Line Items]        
Amount borrowed   $ 400.0    
Number of days borrowed   84 days    
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] | LIBOR [Member]        
Financing [Line Items]        
Weighted-average interest rate   3.45%    
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Three Days [Member]        
Financing [Line Items]        
Amount borrowed     $ 100.0  
Number of days borrowed     3 days  
Weighted-average interest rate     4.25%  
Revolving Credit Facility [Member] | JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Two Overnight Basis [Member] | Subsequent Event [Member]        
Financing [Line Items]        
Weighted-average amount borrowed $ 187.8      
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member]        
Financing [Line Items]        
Amounts outstanding   $ 0.0 $ 0.0  
Amount borrowed   $ 400.0 $ 400.0  
Number of days borrowed   92 days 42 days  
Weighted-average interest rate   3.55% 2.80%  
Weighted-average amount borrowed   $ 375.6 $ 144.8  
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member]        
Financing [Line Items]        
Amount borrowed   $ 400.0    
Number of days borrowed   84 days    
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Eighty Four Days [Member] | LIBOR [Member]        
Financing [Line Items]        
Weighted-average interest rate   3.45%    
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven Days [Member]        
Financing [Line Items]        
Amount borrowed     $ 300.0  
Number of days borrowed     7 days  
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Seven Days [Member] | LIBOR [Member]        
Financing [Line Items]        
Weighted-average interest rate     2.13%  
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Thirty Days [Member]        
Financing [Line Items]        
Amount borrowed     $ 75.0  
Number of days borrowed     30 days  
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Thirty Days [Member] | LIBOR [Member]        
Financing [Line Items]        
Weighted-average interest rate     2.19%  
Revolving Credit Facility [Member] | JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Two Overnight Basis [Member] | Subsequent Event [Member]        
Financing [Line Items]        
Weighted-average amount borrowed 178.0      
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member]        
Financing [Line Items]        
Amounts outstanding   $ 0.0 $ 0.0  
Amount borrowed   $ 58.9 $ 59.9  
Number of days borrowed   359 days 358 days  
Weighted-average interest rate   2.81% 1.94%  
Weighted-average amount borrowed   $ 56.1 $ 57.2  
Revolving Credit Facility [Member] | PNC $150 Million Credit Facility [Member] | PNC Bank, National Association [Member] | Subsequent Event [Member]        
Financing [Line Items]        
Amounts outstanding $ 54.9      
Standby Letters of Credit [Member]        
Financing [Line Items]        
Maximum borrowing capacity   148.9 56.8  
Amounts outstanding   $ 0.0 0.0  
Standby Letters of Credit [Member] | Extended [Member] | Subsequent Event [Member]        
Financing [Line Items]        
Expiration date Jul. 01, 2020      
Line of Credit [Member]        
Financing [Line Items]        
Number of terminated lines of credit | loan       4
Amounts outstanding     $ 0.0  
Maximum borrowing capacity       $ 900.0
Minimum [Member] | Standby Letters of Credit [Member]        
Financing [Line Items]        
Expiration date   Jul. 01, 2019    
Maximum [Member] | Standby Letters of Credit [Member]        
Financing [Line Items]        
Expiration date   Jul. 01, 2020