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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Assets and Liabilities, Lessee [Abstract]          
Operating lease ROU assets $ 96.4   $ 96.4   $ 76.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent   Other Assets, Noncurrent
Finance lease ROU assets [1] $ 6.8   $ 6.8   $ 6.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] [1] Property, Plant and Equipment, Net   Property, Plant and Equipment, Net   Property, Plant and Equipment, Net
Operating lease liabilities, current $ 19.7   $ 19.7   $ 15.3
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Operating lease liabilities, noncurrent $ 78.5   $ 78.5   $ 62.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
Finance lease liabilities, current $ 0.5   $ 0.5   $ 0.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Long-Term Debt and Lease Obligation, Current   Long-Term Debt and Lease Obligation, Current   Long-Term Debt and Lease Obligation, Current
Finance lease liabilities, noncurrent $ 2.2   $ 2.2   $ 1.9
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-Term Debt and Lease Obligation   Long-Term Debt and Lease Obligation   Long-Term Debt and Lease Obligation
Accumulated amortization $ 4.0   $ 4.0   $ 3.7
Lease, Cost [Abstract]          
Operating lease expense [2] 8.5 $ 6.1 23.1 $ 17.6  
Finance lease expense: Depreciation of ROU assets 0.1 0.1 0.4 0.4  
Finance lease expense: Interest on lease liabilities 0.0 0.0 0.1 0.1  
Total lease expense 8.6 6.2 23.6 18.1  
Short-term lease expense $ 1.7 $ 1.4 $ 4.8 $ 4.3  
[1] Finance right of use (“ROU”) assets were recorded net of accumulated amortization of $4.0 million and $3.7 million as of December 31, 2024 and March 31, 2024, respectively.
[2] For the three and nine months ended December 31, 2024, operating lease expense included short-term lease expense of $1.7 million and $4.8 million, respectively. For the three and nine months ended December 31, 2023, operating lease expense included short-term lease expense of $1.4 million and $4.3 million, respectively. Variable lease expense was not significant.