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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense $ 7.8 $ 34.6
Impact of accelerated vesting on equity awards 0.6 0.0
Total share-based compensation expense 8.4 34.6
Tax impact (1.5) (6.6)
Reduction in net income 6.9 28.0
Stock Options    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 1.7 9.4
Restricted Share Units and Other Share-based Compensation    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense 5.8 22.9
Share Appreciation Rights (SARs)    
Share-Based Compensation Expense [Line Items]    
Share-based compensation expense $ 0.3 $ 2.3