Non-Controlling Interest, Acquisitions and Disposals of Interests held by Non-Controlling Interest Holders, Tax

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	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