Fair Value Measurements - Schedule of Assets and Liabilities Required to be Carried at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2024
Assets:
Forward exchange contracts (see Note 18)	$ 1.9	$ 0.0
Interest rate swaps (see Note 18)	0.7	35.6
Liabilities:
Forward exchange contracts (see Note 18)	0.0	(2.8)
Interest rate swaps (see Note 18)	0.0	0.0
Level 1
Assets:
Forward exchange contracts (see Note 18)	0.0	0.0
Interest rate swaps (see Note 18)	0.0	0.0
Liabilities:
Forward exchange contracts (see Note 18)	0.0	0.0
Interest rate swaps (see Note 18)	0.0	0.0
Level 2
Assets:
Forward exchange contracts (see Note 18)	1.9	0.0
Interest rate swaps (see Note 18)	0.7	35.6
Liabilities:
Forward exchange contracts (see Note 18)	0.0	(2.8)
Interest rate swaps (see Note 18)	$ 0.0	$ 0.0