Quarterly report pursuant to Section 13 or 15(d)

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

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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Equity, Class of Treasury Stock [Line Items]          
Common stock issued in connection with exercise or vesting of stock-based awards   0.5 0.1 1.1 0.6
Common stock repurchased and retired, values       $ 171.9 $ 32.8
Authorized in July 2016 [Member]          
Equity, Class of Treasury Stock [Line Items]          
Common stock repurchased and retired, shares     0.0   0.5
Common stock repurchased and retired, values         $ 32.8
Authorized In May 2019 [Member]          
Equity, Class of Treasury Stock [Line Items]          
Expiration date May 31, 2022        
Common stock repurchased and retired, shares   0.0   2.0  
Common stock repurchased and retired, values       $ 171.9  
Maximum [Member] | Authorized In May 2019 [Member]          
Equity, Class of Treasury Stock [Line Items]          
Approved repurchase amount $ 400.0