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Capital Stock (Shares Repurchased) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 2 Months Ended 12 Months Ended 156 Months Ended
May 27, 2020
Mar. 31, 2020
May 27, 2020
Feb. 02, 2016
Feb. 01, 2016
Equity, Class of Treasury Stock [Line Items]          
Share repurchase plan, authorized amount       $ 468.0 $ 300.0
Common shares repurchased, value   $ 3.8      
Subsequent Event          
Equity, Class of Treasury Stock [Line Items]          
Common shares repurchased, value     $ 288.1    
Share repurchase plan, remaining capacity $ 179.9   $ 179.9    
Class A Voting Common Shares          
Equity, Class of Treasury Stock [Line Items]          
Common shares repurchased, number of shares   0.7      
Common shares repurchased, value   $ 3.8      
Common shares repurchased, average cost per share   $ 5.43      
Class A Voting Common Shares | Subsequent Event          
Equity, Class of Treasury Stock [Line Items]          
Common shares repurchased, value $ 1.0