Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Taxes [Line Items]
Effective tax rate	21.40%	26.50%	16.10%	26.50%
Three-year cumulative pretax income (loss)					$ 150.9
Valuation allowance					$ 54.2
Increase in valuation allowance for deferred tax assets	$ 9.4
Addi- tional Paid-In Capital
Income Taxes [Line Items]
Increase in valuation allowance for deferred tax assets			$ 22.5
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