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Long-Term Debt Leases (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.70% 6.60% 6.50%
Operating leases, future minimum payments due, current $ 26.3    
Operating leases, future minimum payments, due in two years 20.0    
Operating leases, future minimum payments, due in three years 18.2    
Operating leases, future minimum payments, due in four years 12.2    
Operating leases, future minimum payments, due in five years 9.8    
Operating lease expense 28.6 $ 26.9 $ 25.3
Capital Lease Obligations [Member]      
Capital leased assets, gross 10.1 8.8  
Capital leases, balance sheet, assets by major class, net $ 5.3 $ 5.5  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 16.00%