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Leases (Leases Reflected on Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating leases right of use assets $ 147.7 $ 124.2
Finance 2.6 3.0
Total leased assets 150.3 127.2
Accumulated depreciation 2.8 2.2
Current    
Operating 7.8 6.8
Finance 1.2 1.2
Noncurrent    
Operating 142.5 118.5
Finance 0.9 1.2
Total lease liabilities $ 152.4 $ 127.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:DeferredCreditsAndOtherLiabilities us-gaap:DeferredCreditsAndOtherLiabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations