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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense $ 23.8 $ 13.7
Total share-based compensation expense 23.8 22.2
Tax impact [1] (8.5) (8.1)
Reduction in net income 15.3 14.1
Stock Options    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 12.3 7.7
Restricted Share Units and Other Share-based Compensation    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 10.4 6.0
Share Appreciation Rights (SARs)    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 1.1 0.0
Restricted Stock and Restricted Share Units (RSUs) | Annual Bonus Plan    
Share-Based Compensation Expense [Line Items]    
Immediately vested restricted share units issued under annual bonus program [2] $ 0.0 $ 8.5
[1] Represents the income tax benefit recognized in the statements of income for share-based compensation arrangements.
[2] Represents the impact of immediately vested stock awards granted as part of our annual bonus program, and issued in lieu of cash bonuses.