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Leases - Future Minimum Lease Payments Under Non-Cancelable Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 29.7
2020 27.0
2021 22.7
2022 19.5
2023 17.2
Thereafter 148.6
Total future minimum lease payments $ 264.7