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Capital Stock (Shares Repurchased) (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended 132 Months Ended
Mar. 31, 2016
May 24, 2018
Feb. 02, 2016
Feb. 01, 2016
Equity, Class of Treasury Stock [Line Items]        
Share repurchase plan, authorized amount     $ 468.0 $ 300.0
Shares Repurchased (in shares) 3.6      
Aggregate cost of shares repurchased $ 73.2      
Subsequent Event        
Equity, Class of Treasury Stock [Line Items]        
Aggregate cost of shares repurchased   $ 283.2    
Share repurchase plan, remaining capacity   $ 184.7