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Statements of Consolidated Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net actuarial gains (losses) and prior service costs arising during period, tax | $ (12.6) | $ 3.4 | $ 1.3
Pension and other post retirement benefit adjustments, reclassification tax | (2.1) | (0.4) | (7.3)
Unrealized holding losses on cash flow hedges, amounts reclassified from other comprehensive loss, tax | 1.0 | 2.2 | 2.8
Net Investment Hedging |  |  |
Foreign currency translation adjustments | $ 37.1 | $ (54.0) | $ 1.1

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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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