Annual report pursuant to Section 13 and 15(d)

Basic and Diluted Earnings Per Share (Narrative) (Details)

v3.20.2
Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 31, 2019
May 31, 2020
May 31, 2019
May 31, 2018
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased and retired, values   $ 171.9 $ 56.9 $ 143.1
Authorized In May 2019 [Member]        
Equity, Class of Treasury Stock [Line Items]        
Expiration date May 31, 2022      
Common stock repurchased and retired, shares   2.0    
Common stock repurchased and retired, values   $ 171.9    
Previously Authorized Repurchase Program [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased and retired, shares     0.7 2.5
Common stock repurchased and retired, values     $ 56.9 $ 143.1
Maximum [Member] | Authorized In May 2019 [Member]        
Equity, Class of Treasury Stock [Line Items]        
Approved repurchase amount $ 400.0   $ 400.0