Leases (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Lease Assets and Liabilities [Abstract]
Operating lease ROU assets		$ 71.6		$ 71.6		$ 59.1
Operating lease ROU assets, Statement of Financial Position [Extensible List]		Other noncurrent assets		Other noncurrent assets		Other noncurrent assets
Finance lease ROU assets	[1]	$ 6.8		$ 6.8		$ 7.1
Finance lease ROU assets, Statement of Financial Position [Extensible List]		Property, plant and equipment - net		Property, plant and equipment - net		Property, plant and equipment - net
Operating lease liabilities, current		$ 13.0		$ 13.0		$ 11.8
Operating lease liabilities, current, Statement of Financial Position [Extensible List]		Other current liabilities		Other current liabilities		Other current liabilities
Operating lease liabilities, noncurrent		$ 59.8		$ 59.8		$ 48.9
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List]		Other noncurrent liabilities		Other noncurrent liabilities		Other noncurrent liabilities
Finance lease liabilities, current		$ 0.4		$ 0.4		$ 0.4
Finance lease liabilities, current, Statement of Financial Position [Extensible List]		Long-term debt - current portion		Long-term debt - current portion		Long-term debt - current portion
Finance lease liabilities, noncurrent		$ 2.0		$ 2.0		$ 2.3
Finance lease liabilities, noncurrent, Statement of Financial Position [Extensible List]		Long-term debt		Long-term debt		Long-term debt
Accumulated amortization		$ 3.6		$ 3.6		$ 3.2
Components of Lease Expense [Abstract]
Operating lease expense	[2]	6.1	$ 5.2	17.6	$ 16.0
Depreciation of ROU assets		0.1	0.1	0.4	0.4
Interest on lease liabilities		0.0	0.0	0.1	0.1
Total lease expense		6.2	5.3	18.1	16.5
Short-term lease expense		$ 1.4	$ 1.4	$ 4.3	$ 4.2

[1] Finance right of use (“ROU”) assets were recorded net of accumulated amortization of $3.6 million and $3.2 million as of December 31, 2023 and March 31, 2023, respectively.

[2] For the three and nine months ended December 31, 2023, operating lease expense included short-term lease expense of $1.4 million and $4.3 million, respectively. For the three and nine months ended December 31, 2022, operating lease expense included short-term lease expense of $1.4 million and $4.2 million, respectively. Variable lease expense was not significant.