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Leases (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Leases [Abstract]      
Operating Lease, Weighted Average Remaining Lease Term 3 years 10 months 25 days   3 years 10 months 25 days
Operating Lease, Weighted Average Discount Rate, Percent 12.10%   12.10%
Operating Lease, Right-of-Use Asset $ 7.3   $ 7.3
Operating Lease, Liability, Current 2.4   2.4
Operating Lease, Liability, Noncurrent 7.3   7.3
Operating Lease, Liability 9.7   9.7
Operating Lease, Expense 0.3 $ 0.9  
Operating Lease, Expense Adjustment 0.5    
Operating Lease, Payments     $ 0.8
Operating Lease, Liability, Increase $ 2.9