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Leases Supplemental Balance Sheet Information Related to Operating Leases (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating Lease, Right-of-Use Asset $ 12.3 $ 13.2  
Operating Lease, Liability, Current 3.5   $ 0.0
Operating Lease, Liability, Noncurrent 10.2    
Operating Lease, Liability $ 13.7 $ 14.5  
Operating Lease, Weighted Average Remaining Lease Term 6 years 11 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 8.25%