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Leases - Lease Cost and Other Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases - Lease Cost and Other Information [Abstract]    
Total operating lease costs [1] $ 3.3 $ 6.1
Operating cash flows from operating leases $ 2.0 $ 4.0
[1]
Includes short-term leases and variable lease costs, which are immaterial.