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Additional Financial Information (Other Assets and Other Accrued Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Mar. 31, 2024
Other current assets    
Prepaid expenses and other $ 54.4 $ 58.2
Restricted cash 42.8 43.7
Contract assets 72.5 59.9
Interest rate swap assets 0.0 35.6
Tax credits receivable 140.7 199.1
Other current assets 310.4 396.5
Other non-current assets    
Prepaid expenses and other 18.6 21.6
Restricted cash 10.8 13.7
Accounts receivable 48.0 111.7
Contract assets 10.3 3.2
Tax credits receivable 440.6 361.7
Operating lease right-of-use assets 338.6 388.8
Interest rate swap assets 0.7 0.0
Other non-current assets $ 867.6 $ 900.7