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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Taxes [Line Items]          
Effective tax rate (11.30%) 31.00% 20.20% 28.00%  
Three-year cumulative pretax income (loss)         $ 150.9
Valuation allowance         $ 54.2
Increase in valuation allowance for deferred tax assets $ 37.7        
Minimum          
Income Taxes [Line Items]          
Estimated income tax refunds under CARES Act 40.0   $ 40.0    
Maximum          
Income Taxes [Line Items]          
Estimated income tax refunds under CARES Act $ 50.0   $ 50.0