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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Remainder of 2019 $ 3.5  
2020 13.9  
2021 13.9  
2022 13.9  
2023 13.9  
Thereafter 109.1  
Total $ 168.2 $ 180.5