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Capital Stock (Unrecognized Compensation Cost) (Details)
$ in Millions
12 Months Ended
Mar. 31, 2024
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Unrecognized Compensation Cost $ 56.8
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Unrecognized Compensation Cost $ 2.3
Weighted Average Remaining Years 1 year 6 months
Restricted Share Units (RSUs) and Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Unrecognized Compensation Cost $ 54.5
Weighted Average Remaining Years 1 year 6 months