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Additional Financial Information (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Additional Financial Information [Abstract]      
Interest paid $ 242.5 $ 196.7 $ 135.0
Income taxes paid, net 25.8 29.1 16.9
Non-cash investing activities      
Accrued equity method investment 0.0 0.0 19.0
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows for operating leases 55.5 42.3 57.0
Right-of-use assets obtained in exchange for new lease obligations:      
Operating leases 172.1 12.4 67.8
Increase in right-of-use assets and lease liability due to a reassessment event:      
Operating leases - increase in right-of-use assets 103.6 33.0 27.5
Operating leases - increase in lease liability $ 103.6 $ 33.0 $ 27.5