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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 14.5 $ 15.1 $ 23.8 $ 30.2
Total share-based compensation expense 14.5 15.1 24.1 30.2
Tax impact [1] (3.1) (3.4) (5.1) (6.9)
Reduction in net income 11.4 11.7 19.0 23.3
Employee Stock Options, Restricted Stock and Restricted Share Units [Member]        
Share-Based Compensation Expense [Line Items]        
Impact of accelerated vesting on equity awards [2] 0.0 0.0 0.3 0.0
Stock Options        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 5.2 6.7 8.8 13.5
Restricted Share Units and Other Share-based Compensation        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 8.5 7.2 13.3 13.9
Share Appreciation Rights (SARs)        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 0.8 $ 1.2 $ 1.7 $ 2.8
[1]
Represents the income tax benefit recognized in the statements of operations for share-based compensation arrangements.
[2]
Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.