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Leases (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]      
Operating Lease, Weighted Average Remaining Lease Term 3 years 7 months 6 days 5 years 3 months 18 days  
Operating Lease, Weighted Average Discount Rate, Percent 10.10% 12.50%  
Operating Lease, Right-of-Use Asset $ 7.9 $ 2.1  
Operating Lease, Liability, Current 3.3 0.9  
Operating Lease, Liability, Noncurrent 6.1 3.0  
Operating Lease, Liability 9.4 3.9  
Operating Lease, Expense (0.7) (0.5) $ (2.6)
Operating Lease, Expense Adjustment (1.6) (2.0) (0.3)
Operating Lease, Payments $ (1.6) (2.4) $ (3.2)
Operating Lease, Liability, Decrease   $ (1.0)  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other long-term assets Other long-term assets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts payable and accrued liabilities Accounts payable and accrued liabilities  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities  
Increase (Decrease) in Operating Lease Liability $ 6.6