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Share-Based Compensation - Schedule of Share-based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: $ 17.5 $ 23.2 $ 25.7
Impact of accelerated vesting on equity awards 0.5 1.4 0.0
Share-Based Compensation Expense, Including Accelerated Compensation Cost 18.0 24.6 25.7
Tax impact (4.3) (5.9) (6.2)
Increase in net loss 13.7 18.7 19.5
Discontinued Operations      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Share-Based Compensation Expense, Including Accelerated Compensation Cost 0.3 1.8 3.0
Operating Segments      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: 16.8 17.6 16.0
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: 0.7 5.6 9.7
Stock options | Operating Segments      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: 0.0 0.0 0.4
Restricted share units | Operating Segments      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: 16.8 17.6 15.7
Share appreciation rights | Operating Segments      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Compensation Expense: $ 0.0 $ 0.0 $ (0.1)