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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Cash paid for income taxes | $ 1.7 | $ 1.6 | $ 2.2
Valuation allowance | 91.1 | 77.9 |
Increase in valuation allowance | 13.2 |  |
Valuation allowance that if recognized, would credit directly to contributed capital | 16.8 |  |
Accrued interest and penalties related to uncertain tax positions | 0.1 | 0.1 |
Uncertain tax positions that would impact effective tax rate | 0.1 | $ 0.1 |
Additional Paid-in Capital |  |  |
Income Tax Contingency [Line Items] |  |  |
Additional-paid-in-capital increase, due to tax effect of disposals of shares of noncontrolling interests | 2.8 |  |
Capital Loss Carryforward |  |  |
Income Tax Contingency [Line Items] |  |  |
Capital loss carryforwards | 6.2 |  |
General Business Tax Credit Carryforward |  |  |
Income Tax Contingency [Line Items] |  |  |
Capital loss carryforwards | 0.7 |  |
Interest Limitation |  |  |
Income Tax Contingency [Line Items] |  |  |
Capital loss carryforwards | 278.4 |  |
Domestic Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | 615.7 |  |
Subject to expiration | 516.2 |  |
State and Local Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforwards | $ 678.9 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of valuation allowance for tax benefit to be credited to shareholders' equity if tax benefit subsequently becomes realizable. Includes, but is not limited to, adjustment to opening balance of retained earnings for change in accounting principle or correction of error, gain (loss) in comprehensive income (loss) but excluded from net income (loss), deductible expenditure for income tax purposes reported as reduction of shareholders' equity, and deductible temporary difference existing at date of quasi-reorganization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120385591&loc=d3e39076-109324 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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