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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Future minimum payments on noncancelable leases in 2019 $ 11.2    
Future minimum payments on noncancelable leases in 2020 9.2    
Future minimum payments on noncancelable leases in 2021 6.5    
Future minimum payments on noncancelable leases in 2022 6.4    
Future minimum payments on noncancelable leases in 2023 11.4    
Future minimum payments on noncancelable leases due in later years 15.3    
Rental expense 15.5 $ 13.1 $ 11.1
Contractual Obligation, Fiscal Year Maturity [Abstract]      
Contractual obligations due in 2019 399.9    
Contractual obligations due in 2020 400.5    
Contractual obligations due in 2021 385.9    
Contractual obligations due in 2022 182.3    
Contractual obligations due in 2023 33.6    
Contractual obligations due in later years $ 13.7