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Income Taxes - Rollforward of Deferred Tax Assets Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | $ 102.4 | $ 108.8 | $ 123.0
Change in assessment | (39.5) | (1.1) | (1.9)
Current year operations | 10.4 | (5.3) | (12.3)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 73.3 | 102.4 | 108.8
State and Local Jurisdiction [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 39.5 | 35.7 | 40.4
Change in assessment | (23.1) | 0.0 | 0.0
Current year operations | (0.8) | 3.8 | (4.7)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 15.6 | 39.5 | 35.7
Foreign Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 62.9 | 73.1 | 82.6
Change in assessment | (16.4) | (1.1) | (1.9)
Current year operations | 11.2 | (9.1) | (7.6)
Deferred Tax Assets, Valuation Allowance, Ending Balance | $ 57.7 | $ 62.9 | $ 73.1

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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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