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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Lease Assets and Liabilities [Abstract]      
Operating lease ROU assets $ 63.6   $ 61.4
Operating lease ROU assets, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent    
Finance lease ROU assets [1] $ 8.4   8.5
Finance lease ROU assets, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet    
Operating lease liabilities, current $ 11.8   10.9
Operating lease liabilities, current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent    
Operating lease liabilities, Other noncurrent liabilities $ 52.3   50.3
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent    
Finance lease liabilities, current $ 0.4   0.4
Finance lease liabilities, current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent    
Finance lease liabilities, noncurrent $ 3.3   3.3
Finance lease liabilities, noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations    
Accumulated amortization $ 1.9   $ 1.8
Components of Lease Expense [Abstract]      
Operating lease expense [2] 4.9 $ 5.2  
Finance lease expense [Abstract]      
Depreciation of ROU assets 0.1 0.1  
Interest on lease liabilities 0.0 0.0  
Total lease expense 5.0 5.3  
Short-term lease expense $ 0.9 $ 0.9  
[1] Finance lease ROU assets were recorded net of accumulated amortization of $1.9 million and $1.8 million as of June 30, 2020 and March 31, 2020, respectively.
[2] For both the three months ended June 30, 2020 and 2019, operating lease expense included short-term lease expense of $0.9 million. Variable lease expense was not significant.