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Commitments and Contingencies - Leases (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
lease
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Number of leases that require rent to be paid based on contingent events | lease 0    
Rent expense | $ $ 32.1 $ 26.3 $ 23.8