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Leases (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]        
Operating Lease, Weighted Average Remaining Lease Term 3 years 2 months 12 days   3 years 2 months 12 days  
Operating Lease, Right-of-Use Asset $ 4.6   $ 4.6  
Operating Lease, Liability, Current 2.4   2.4 $ 2.5
Operating Lease, Liability, Noncurrent 4.3   4.3  
Operating Lease, Liability 6.7   6.7  
Operating Lease, Expense     2.6 2.7
Operating Lease, Expense Adjustment     (0.3) $ (0.5)
Operating Lease, Payments     3.2  
Operating Lease, Liability, Increase $ 1.4 $ 3.8    
Operating Lease, Liability, Decrease     $ 0.2  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets   us-gaap:OtherAssets us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accounts payable and accrued liabilities   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 Other long-term liabilities