Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Amount of cost for defined contribution plan.

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Amount of defined benefit plan asset acquired, at the acquisition date.

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The non cash termination loss related to defined benefit plan.

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Defined contribution and defined benefit retirement plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 16, 2024
Defined benefit pension plans [Line Items]
Non cash defined benefit plan termination loss			$ 6.2
Defined contribution plan expense		$ 7.7	8.2	$ 8.0
Defined Benefit Pension Plans
Defined benefit pension plans [Line Items]
Non cash defined benefit plan termination loss	$ 6.2
Expected contribution		16.0
Expect to recognize unrecognized actuarial gains (losses)		0.1	3.2
Defined Benefit Pension Plans \| Louisiana Pigment Company
Defined benefit pension plans [Line Items]
Net pension asset					$ 10.6
Defined Benefit Pension Plans \| Non U.S.
Defined benefit pension plans [Line Items]
Net overfunded status		$ (108.4)	$ (141.1)
Discount rate		3.60%	3.40%
Long-term return on plan assets		4.90%	4.60%	2.50%
Defined Benefit Pension Plans \| Canada \| Equity Securities \| Minimum [Member]
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		10.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		51.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Minimum [Member]
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		90.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Maximum [Member]
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		100.00%
Defined Benefit Pension Plans \| Norway \| Significant Unobservable Inputs (Level 3)
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		15.00%
Defined Benefit Pension Plans \| Norway \| Equity Securities
Defined benefit pension plans [Line Items]
Long-term return on plan assets		7.00%
Percentage of plan asset allocation		18.00%
Defined Benefit Pension Plans \| Norway \| Fixed Income Funds
Defined benefit pension plans [Line Items]
Percentage of plan asset allocation		63.00%
Defined Benefit Pension Plans \| Norway \| Real Estate.
Defined benefit pension plans [Line Items]
Long-term return on plan assets		7.00%
Percentage of plan asset allocation		14.00%
Defined Benefit Pension Plans \| Norway \| Other Investments And Liquid Funds
Defined benefit pension plans [Line Items]
Long-term return on plan assets		8.00%
Defined Benefit Pension Plans \| United States
Defined benefit pension plans [Line Items]
Net overfunded status		$ 10.5	$ (2.4)
Discount rate		5.50%	5.00%
Long-term return on plan assets		5.00%	5.00%	4.00%
Defined Benefit Pension Plans \| United States \| Equity Securities
Defined benefit pension plans [Line Items]
Long-term return on plan assets		7.00%
Percentage of plan asset allocation		17.00%
Defined Benefit Pension Plans \| United States \| Fixed Income Funds
Defined benefit pension plans [Line Items]
Long-term return on plan assets		5.00%
Percentage of plan asset allocation		80.00%