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Leases - Future Undiscounted Payments Under Operating Lease Arrangements Under ASC Topic 842 (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (remaining) $ 47.4  
2020 59.9  
2021 53.5  
2022 42.4  
2023 35.4  
Thereafter 136.5  
Total lease payments, undiscounted 375.1  
Less: discount 101.5  
Total operating lease liability as of March 31, 2019, at present value 273.6  
Less: operating lease liability, current 42.7 $ 0.0
Operating lease liability as of March 31, 2019, long term $ 230.9 $ 0.0