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Lease Obligations (Future Minimum Rental Commitments For All Long-Term Non-Cancelable Operating Leases) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 35.9
2020 30.7
2021 26.2
2022 19.9
2023 13.1
Thereafter 18.0
Total $ 143.8