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Capital Stock (Share-based Compensation Expense by Category) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 22.5 $ 27.1 $ 40.6 $ 43.5
Direct operating        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0.8 0.9 1.4 1.4
Distribution and marketing        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 0.2 0.3 0.5 0.4
General and administration        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense 16.6 24.8 33.8 40.1
Restructuring and other        
Share-Based Compensation Expense [Line Items]        
Share-based compensation expense $ 4.9 $ 1.1 $ 4.9 $ 1.6