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Leases - Future Minimum Obligations Under Non-Cancelable Operating Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 5.8
2020 5.0
2021 4.4
2022 3.6
2023 3.0
Thereafter 8.1
Total $ 29.9