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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 1.9 $ 5.5
Short-term lease cost 0.5 1.5
Total lease cost $ 2.4 $ 7.0