Leases - Schedule of Lease Expense and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 63.1	$ 70.4
Other assets:
ROU assets	154.3	119.5
Accrued liabilities:
Current portion of lease liabilities	39.8	44.5
Other long-term liabilities:
Non-current portion of lease liabilities	125.4	94.7
Total lease liabilities	$ 165.2	$ 139.2
Right-of-use assets [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets
Current portion of lease liabilities [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Non-current portion of lease liabilities [Extensible List]	Non-current portion of lease liabilities	Non-current portion of lease liabilities
Weighted average remaining lease-term (in years)	6 years 10 months 17 days
Weighted average discount rate	4.49%