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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Lease Assets and Liabilities [Abstract]          
Operating lease ROU assets $ 52.8   $ 52.8   $ 54.1
Operating lease ROU assets, Statement of Financial Position [Extensible List] Other noncurrent assets   Other noncurrent assets   Other noncurrent assets
Finance lease ROU assets [1] $ 8.0   $ 8.0   $ 8.3
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 $ 12.7   $ 12.7   $ 11.2
Operating lease liabilities, current, Statement of Financial Position [Extensible List] Other current liabilities   Other current liabilities   Other current liabilities
Operating lease liabilities, noncurrent $ 41.8   $ 41.8   $ 44.8
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 $ 3.0   $ 3.0   $ 3.2
Finance lease liabilities, noncurrent, Statement of Financial Position [Extensible List] Long-term debt   Long-term debt   Long-term debt
Accumulated amortization $ 2.7   $ 2.7   $ 2.4
Components of Lease Expense [Abstract]          
Operating lease expense [2] 5.2 $ 4.8 14.6 $ 14.9  
Finance lease expense [Abstract]          
Depreciation of ROU assets 0.1 0.2 0.4 0.4  
Interest on lease liabilities 0.0 0.0 0.1 0.1  
Total lease expense 5.3 5.0 15.1 15.4  
Short-term lease expense $ 1.0 $ 0.9 $ 2.8 $ 2.7  
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
[1] Finance lease ROU assets were recorded net of accumulated amortization of $2.7 million and $2.4 million as of December 31, 2021 and March 31, 2021, respectively.
[2] For the three and nine months ended December 31, 2021, operating lease expense included short-term lease expense of $1.0million and $2.8 million, respectively.  For the three and nine months ended December 31, 2020, operating lease expense included short-term lease expense of $0.9 million and $2.7 million, respectively. Variable lease expense was not significant.