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Leases - Future Minimum Rental Payments Under Topic 840 (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 54.2
2020 41.2
2021 32.4
2022 24.0
2023 13.5
Thereafter 16.1
Total lease payments $ 181.4