Leases - Schedule of Lease Expense and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease expense	$ 60.4	$ 56.6	$ 58.4
Other assets:
ROU assets	156.3	154.0
Accrued liabilities:
Current portion of lease liabilities	32.6	31.5
Other long-term liabilities:
Non-current portion of lease liabilities	128.7	128.6
Total lease liabilities	$ 161.3	$ 160.1
Right-of-use assets [Extensible List]	Other Assets, Noncurrent	Other Assets, Noncurrent
Current portion of lease liabilities [Extensible List]	Accrued Liabilities, Current	Accrued Liabilities, Current
Non-current portion of lease liabilities [Extensible List]	Other long-term liabilities	Other long-term liabilities
Weighted average remaining lease-term (in years)	5 years 7 months 9 days
Weighted average discount rate	4.52%