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Lease Obligations (Schedule of Future Minimum Capital Lease Payments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019 $ 5.9  
2020 4.9  
2021 4.1  
2022 2.0  
2023 0.2  
2024 and thereafter 0.0  
Total minimum payments 17.1  
Less: amounts representing interest (1.7)  
Present value of minimum payments 15.4  
Less: current portion (5.1) $ (5.6)
Long-term capital lease obligations $ 10.3 $ 13.7