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Leases (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.90% 5.70% 6.60%
Gain on settlement of capital lease $ 15.6 $ 0.0 $ 0.0
Operating leases, future minimum payments due, current 32.6    
Operating leases, future minimum payments, due in two years 24.3    
Operating leases, future minimum payments, due in three years 16.2    
Operating leases, future minimum payments, due in four years 12.6    
Operating leases, future minimum payments, due in five years 7.5    
Operating lease expense 36.9 28.6 $ 26.9
Capital Lease Obligations [Member]      
Capital leased assets, gross 10.5 10.1  
Capital leases, balance sheet, assets by major class, net $ 3.4 $ 5.3  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 7.90%    
Repayments of Debt and Capital Lease Obligations $ 11.4