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Leases - Operating Lease Estimated Future Minimum Rental Commitments Before Adoption of ASC 842 (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 28.5
2020 20.1
2021 14.7
2022 10.1
2023 6.9
Thereafter 17.0
Total lease payments $ 97.3