| Leases - Supplemental Cash Flow and Other Lease Information (Details) - USD ($) $ in Millions | 12 Months Ended | ||
|---|---|---|---|
| Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | |
| Leases [Abstract] | |||
| Operating cash flows used for operating leases | $ 23.8 | $ 19.2 | |
| Operating cash flows used for finance leases | 0.1 | 0.1 | |
| Financing cash flows used for finance leases | 1.0 | 0.8 | $ 0.4 | 
| Non-cash ROU assets obtained in exchange for new lease liabilities | 31.8 | 26.0 | |
| Non-cash remeasurements reducing lease liabilities | 1.3 | (5.1) | |
| Non-cash remeasurements reducing ROU assets | $ 1.3 | $ (5.1) | |
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- Definition Lease Liabilities, Increase (Decrease) due to Remeasurement No definition available. 
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- Definition Lease, Right-of-Use Asset, Increase (Decrease) due to Remeasurement No definition available. 
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- Definition Amount of interest paid on finance lease liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of cash outflow for principal payment on finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- References No definition available. 
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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