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Additional Financial Information (Other Assets and Other Accrued Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Mar. 31, 2024
Other current assets    
Prepaid expenses and other $ 67.0 $ 58.2
Restricted cash 48.1 43.7
Contract assets 56.6 59.9
Interest rate swap assets 12.2 35.6
Tax credits receivable 166.6 199.1
Other current assets 350.5 396.5
Other non-current assets    
Prepaid expenses and other 15.2 21.6
Restricted cash 11.6 13.7
Accounts receivable 47.0 111.7
Contract assets 5.2 3.2
Tax credits receivable 394.7 361.7
Operating lease right-of-use assets 347.7 388.8
Interest rate swaps 12.2 35.6
Other non-current assets 821.4 900.7
Employee-related liabilities $ 37.8 $ 147.4