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Leases and Contingencies - Minimum Rental Commitments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 230.7
2019 196.4
2020 121.7
2021 94.2
2022 65.7
2023 and thereafter 166.5
Total 875.2
Minimum commitments for leases that expire in less than one year $ 24.5