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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | $ 108.8 | $ 123.0 | $ 129.8
Change in assessment | (1.1) | (1.9) | (6.2)
Current year operations | (5.3) | (12.3) | (0.6)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 102.4 | 108.8 | 123.0
State and Local Jurisdiction [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 35.7 | 40.4 | 48.5
Change in assessment | 0.0 | 0.0 | 0.0
Current year operations | 3.8 | (4.7) | (8.1)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 39.5 | 35.7 | 40.4
Foreign Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 73.1 | 82.6 | 81.3
Change in assessment | (1.1) | (1.9) | (6.2)
Current year operations | (9.1) | (7.6) | 7.5
Deferred Tax Assets, Valuation Allowance, Ending Balance | $ 62.9 | $ 73.1 | $ 82.6

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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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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