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Additional Financial Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
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