Income Tax Matters - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax (provision) benefit	$ (8.4)	$ 0.7	$ 7.4	$ (10.2)
Effective tax rate (percent)	137.00%	222.00%	27.00%	31.00%
Effective income tax rate reconciliation, change in forecasted earnings percent	116.00%	(211.00%)
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent)	(2.00%)	22.00%	4.00%	4.00%
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, percent	(1.00%)		2.00%	(2.00%)
Effective income tax rate reconciliation, tax credits, percent			3.00%
Effective income tax rate reconciliation, change in state tax rate, percent			2.00%
Effective income tax rate reconciliation, decrease to permanent items including nondeductible compensation expense and foreign withholding tax			(7.00%)
Effective income tax rate reconciliation, nondeductible expense, percent				4.00%
Gross unrecognized tax benefits	$ 4.1		$ 4.1		$ 3.8
Gross unrecognized tax benefits that would impact effective tax rate	$ 4.1		$ 4.1		$ 3.8