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Capital Stock - Schedule of Share-based Compensation Expense, by Expense Category (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Total share-based compensation expense $ 7.4 $ 5.2
Continuing Operations    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Total share-based compensation expense 7.4 5.2
Other operating expense | Continuing Operations    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Total share-based compensation expense 0.9 0.8
General and administration | Continuing Operations    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Total share-based compensation expense 4.3 4.4
Restructuring and other | Continuing Operations    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Total share-based compensation expense $ 2.2 $ 0.0