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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Millions | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Oct. 19, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |
Valuation allowance balance – beginning of period | $ 30.7 | $ 29.1 | $ 23.9 | $ 20.7 | $ 29.0
Increases/(decreases) resulting from the Mirion Business Combination | 19.7 | 0.0 | 0.0 | (0.4) | 0.0
Increases resulting from other business combinations | 0.0 | 0.0 | 0.0 | 0.0 | 0.5
Other increases | 0.0 | 1.6 | 9.8 | 5.3 | 8.6
Other decreases | 0.0 | 0.0 | (3.7) | (1.7) | (9.0)
Valuation allowance balance – end of period | $ 20.7 | $ 30.7 | $ 30.0 | $ 23.9 | $ 29.1

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- Definition Valuation Allowance Deferred Tax Asset Increase (Decrease) From Mirion Business Combination + References No definition available. + Details
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- Definition Valuation allowance deferred tax asset increases from business combination. + References No definition available. + Details
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- Definition Valuation allowance deferred tax asset other increases. + References No definition available. + Details
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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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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