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Leases Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lease, Cost [Abstract]        
Operating lease cost $ 3.4   $ 9.7  
Short-term lease cost 0.1   0.5  
Variable lease cost 0.8   2.3  
Total lease cost $ 4.3 $ 3.3 $ 12.5 $ 10.4