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Leases - Lease Cost and Other Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases - Lease Cost and Other Information [Abstract]    
Total operating lease costs [1] $ 3.2 $ 9.3
Operating cash flows from operating leases $ 2.3 $ 6.3
[1]
Includes short-term leases and variable lease costs, which are immaterial.