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Commitments and Contingencies- Operating Lease Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Minimum lease payments under operating leases recognized in the consolidated income statement $ 4.8 $ 5.1 $ 4.8
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 4.2    
2020 4.1    
2021 3.3    
2022 2.7    
Thereafter 13.1    
Total $ 27.4