Additional Financial Information - Schedule of Composition of Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Other current assets
Prepaid expense and other	$ 43.1	$ 34.8
Restricted cash included in other current assets	67.9	43.7
Contract assets	61.4	59.9
Interest rate swap assets	0.0	35.6
Tax credits receivable	186.8	199.1
Other current assets	359.2	373.1
Other non-current assets
Prepaid expenses and other	18.6	18.3
Restricted cash	0.0	13.7
Accounts receivable	65.7	111.7
Contract assets	11.3	3.2
Tax credits receivable	435.8	361.7
Operating lease right-of-use assets	294.1	344.3
Other non-current assets	825.5	852.9
Receivable with imputed interest, discount	7.0	6.2
Contract asset with imputed interest, discount	$ 1.1	$ 0.3