Leases (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Lease Assets and Liabilities [Abstract]
Operating lease ROU assets		$ 54.1	$ 61.4
Operating lease ROU assets, Statement of Financial Position [Extensible List]		Other Assets, Noncurrent	Other Assets, Noncurrent
Finance lease ROU assets		$ 8.3	$ 8.5
Finance lease ROU assets, Statement of Financial Position [Extensible List]		Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Operating lease liabilities, current		$ 11.2	$ 10.9
Operating lease liabilities, current, Statement of Financial Position [Extensible List]		Other Liabilities, Current	Other Liabilities, Current
Operating lease liabilities, noncurrent		$ 44.8	$ 50.3
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List]		Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Finance lease liabilities, current		$ 0.4	$ 0.4
Finance lease liabilities, current, Statement of Financial Position [Extensible List]		Long-term Debt and Lease Obligation, Current	Long-term Debt and Lease Obligation, Current
Finance lease liabilities, noncurrent		$ 3.2	$ 3.3
Finance lease liabilities, noncurrent, Statement of Financial Position [Extensible List]		Long-term Debt and Lease Obligation	Long-term Debt and Lease Obligation
Accumulated amortization		$ 2.4	$ 1.8
Components of Lease Expense [Abstract]
Operating lease expense	[1]	19.5	21.2
Finance lease expense [Abstract]
Depreciation of ROU assets		0.5	0.5
Interest on lease liabilities		0.2	0.2
Total lease expense		20.2	21.9
Short-term lease expense		3.5	4.1
Cash paid for amounts included in measurement of lease liabilities [Abstract]
Operating cash flows for operating leases		14.2	14.7
Financing cash flows for finance leases		0.6	0.5
ROU assets obtained in exchange for lease liabilities [Abstract]
Operating leases		9.8	9.0
Finance leases		$ 0.1	$ 0.2
Weighted-average remaining lease term [Abstract]
Operating leases		6 years 10 months 24 days	9 years 3 months 18 days
Finance leases		7 years 9 months 18 days	8 years 9 months 18 days
Weighted-average discount rate [Abstract]
Operating leases		3.30%	3.50%
Finance leases		4.70%	4.70%
Maturity of Operating Lease Liabilities [Abstract]
2022		$ 12.8
2023		10.9
2024		8.1
2025		6.7
2026		6.1
2027 and beyond		18.5
Total lease payments		63.1
Less: Interest		(7.1)
Present value of lease liabilities		56.0
Maturities of Finance Lease Liabilities [Abstract]
2022		0.6
2023		0.6
2024		0.6
2025		0.6
2026		0.5
2027 and beyond		1.4
Total lease payments		4.3
Less: Interest		(0.7)
Present value of lease liabilities		3.6
Assets Held for Sale [Member]
Lease Assets and Liabilities [Abstract]
Operating lease ROU assets		6.1
Liabilities Held for Sale [Member]
Lease Assets and Liabilities [Abstract]
Operating lease liabilities, current		$ 6.1
Minimum [Member]
Significant Accounting Policy [Abstract]
Remaining lease term		1 year
Maximum [Member]
Significant Accounting Policy [Abstract]
Remaining lease term		13 years

[1] In fiscal 2021 and 2020, operating lease expense included short-term lease expense of $3.5 million and $4.1 million, respectively. Variable lease expense was not significant.