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Lease Obligations (Schedule of Future Minimum Operating Lease Payments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 $ 38.2    
2020 33.4    
2021 23.9    
2022 17.8    
2023 13.7    
2024 and thereafter 31.1    
Total 158.1    
Operating Leases, Rent Expense, Net [Abstract]      
Rent expense under operating leases $ 38.5 $ 37.3 $ 43.7