CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
Dec. 31, 2023	Aug. 12, 2023	Dec. 31, 2022	Dec. 31, 2021
Translation adjustment and foreign currency hedges, tax	$ 0.0	$ 0.0	$ (3.0)	$ (6.6)
Prior service credit (cost) recognized during the year, tax	(0.2)	0.2	0.0	0.0
Net actuarial gains (loss) recognized during the year, tax	2.6	(4.9)	0.0	23.2
Net actuarial (gains) losses occurring during the year, tax	0.0	1.1	0.0	2.0
Net actuarial (gains) losses recognized due to settlement, tax	0.0	1.1	0.0	(0.4)
Acquired benefit plans and other, tax	0.0	0.0	0.0	0.0
Currency impact, tax	0.1	(1.3)	0.0	(0.4)
Foreign exchange forward contracts
Foreign currency hedges, tax	0.0	0.0	0.0	0.0
Interest rate swap
Net income (loss) recognized in other comprehensive income, tax	0.0	0.0	0.7	3.4
Reclassification adjustments for amounts recognized in net income (loss), tax	$ 0.0	$ 0.0	$ 0.1	$ 0.8

Other Comprehensive (Income) Loss, Currency Impact, Tax

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Other Comprehensive Income (Loss), Defined Benefit Plan, Newly Accounted Plans, Tax

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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

Amount of tax expense (benefit) for increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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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.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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