Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Increase (decrease) in deferred tax asset valuation allowance	$ 40.7	$ 30.6	$ (39.5)
Valuation Allowance, Deferred Tax Asset, Explanation of Change	federal net deferred taxes that are more likely than not to be realized	changes in deferred tax assets since the beginning of the year	previously unrecorded state deferred tax assets
Operating Loss Carryforwards					$ 732.0
Operating Loss Carryforwards, No Expiration	$ 131.4	$ 131.4
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		71.3	$ 13.9
Provision (benefit) for income taxes		39.1	1.4
Liability for Uncertain Tax Positions, Noncurrent	1.0	1.0	0.8	$ 0.4
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction		(0.2)	$ (0.4)
Income Tax Examination, Penalties and Interest Accrued	0.1	$ 0.1
Federal Statutory Income Tax Rate, Percent		21.00%	21.00%
State and Local Jurisdiction [Member]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		1.00%	(1.00%)
Operating Loss Carryforwards	0.5	$ 0.5
Operating Loss Carryforwards, Valuation Allowance	465.4	465.4
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 2.0
Tax Year 2018 [Member]
Business Interest Expense Carryforward	$ 4.1	$ 4.1