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Leases (Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lease Assets    
Operating ROU assets $ 165.1 $ 187.3
Finance lease assets 15.1 19.1
Total leased assets $ 180.2 $ 206.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Current:    
Operating $ 43.5 $ 42.3
Finance 3.0 4.5
Noncurrent:    
Operating 125.9 148.6
Finance 9.8 12.0
Total leased liabilities 182.2 207.4
Finance lease, right-of-use asset, accumulated depreciation $ 15.6 $ 15.2