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Additional Financial Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ 11.2 | $ 10.4 | $ 2.0
Increase (decrease) in right-of-use assets and lease liability due to a reassessment event: |  |  |
Operating leases — increase (decrease) in right-of-use assets | 0.0 | 0.0 | 15.6
Operating leases — increase (decrease) in lease liability | $ 0.0 | $ 0.0 | $ 15.6

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