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Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Charitable contribution carryover (CCCs)	$ 23.6	$ 32.9
US State
Operating Loss Carryforwards [Line Items]
Net operating losses	157.0	165.7
Tax credit carryforwards	4.9	5.3
US Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	12.2	12.2
Foreign
Operating Loss Carryforwards [Line Items]
Net operating losses	$ 54.1	$ 36.9

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards.

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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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