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Lease Obligations (Future Minimum Rental Commitments For All Long-Term Non-Cancelable Operating Leases) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Leases [Abstract]  
2018 $ 34.5
2019 27.1
2020 22.0
2021 18.4
2022 13.0
Thereafter 15.3
Total $ 130.3