Income Tax Matters - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax benefit (provision)	$ 0.3	$ (9.6)
Effective tax rate (percent)	(6.00%)	25.00%
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses	$ (0.4)
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent)	(10.00%)
Effective tax rate reconciliation, change in state tax rate, amount	$ (0.6)
Effective income tax rate reconciliation, change in state tax rate, percent	(15.00%)
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, amount	$ (0.2)
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, percent	(6.00%)
Gross unrecognized tax benefits	$ 4.0		$ 3.8
Gross unrecognized tax benefits that would impact effective tax rate	$ 1.5		$ 1.5