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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 23.6 $ 14.9 $ 47.4 $ 28.5
Total share-based compensation expense 23.6 24.0 47.4 46.2
Tax impact [1] (8.3) (8.4) (16.8) (16.0)
Reduction in net income 15.3 15.6 30.6 30.2
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 11.7 8.5 24.0 16.2
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 9.9 6.4 20.2 12.3
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 2.0 0.0 3.2 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 and impact of accelerated vesting on equity awards [2] 0.0 6.7 0.0 15.3
Employee stock options, restricted stock and restricted share units        
Share-Based Compensation Expense [Line Items]        
Immediately vested restricted share units issued under annual bonus program and impact of accelerated vesting on equity awards [3] $ 0.0 $ 2.4 $ 0.0 $ 2.4
[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.
[3] Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.