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Commitments and Contingencies - Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Operating lease expenses $ 56.9 $ 41.6 $ 33.5
Operating leases future minimum lease payments [Abstract]      
2019 49.4    
2020 40.1    
2021 34.8    
2022 28.7    
2023 22.1    
Thereafter 60.9    
Total $ 236.0