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Commitments and Contingencies - Future Operating Lease Payments (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]      
2019 $ 11.1    
2020 10.3    
2021 5.2    
2022 2.5    
2023 1.2    
Thereafter 0.7    
Total 31.0    
Rent expense $ 10.9 $ 9.4 $ 11.0
Minimum      
Lessee, Lease, Description [Line Items]      
Renewal term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Renewal term 5 years