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Pensions (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2026
Net Periodic Benefit Cost [Abstract]          
Net periodic benefit cost [1] $ 1.2 $ 0.8 $ 3.5 $ 2.5  
Pension          
Net Periodic Benefit Cost [Abstract]          
Service cost 0.0 0.0 0.1 0.1  
Interest cost 2.3 2.3 6.8 7.1  
Expected return on plan assets (2.2) (2.5) (6.5) (7.7)  
Amortization of unrecognized net loss 1.2 1.1 3.5 3.4  
Net periodic benefit cost 1.3 $ 0.9 3.9 2.9  
Pension | UNITED STATES          
Defined Benefit Plan, Additional Information [Abstract]          
Contribution U.S. pension plan     6.5 $ 0.0  
Pension | UNITED STATES | Minimum          
Termination of U.S. Pension Plans [Abstract]          
Expected employer contribution during fiscal 2026 10.0   10.0    
Pension | UNITED STATES | Maximum          
Termination of U.S. Pension Plans [Abstract]          
Expected employer contribution during fiscal 2026 $ 20.0   $ 20.0    
Pension | UNITED STATES | Termination plan | Minimum          
Termination of U.S. Pension Plans [Abstract]          
Non-cash pension settlement charges         $ (115.0)
Pension | UNITED STATES | Termination plan | Maximum          
Termination of U.S. Pension Plans [Abstract]          
Non-cash pension settlement charges         $ (125.0)
[1] Net periodic benefit cost for the Company’s pension and postretirement plans is exclusive of service cost.