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Additional Financial Information - Schedule of Composition of Other Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Other current assets    
Prepaid expenses and other $ 32.4 $ 25.2
Restricted cash 73.6 78.3
Contract assets 21.1 22.1
Tax credits receivable 239.5 236.8
Total other current assets 366.6 362.4
Other noncurrent assets    
Prepaid expenses and other 17.2 15.3
Accounts receivable 62.9 75.3
Contract assets 4.1 4.3
Tax credits receivable 421.9 403.6
Operating lease right-of-use assets 259.6 262.9
Total other noncurrent assets $ 765.7 $ 761.4