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 of actuarial present value of benefits attributed to service rendered by employee for 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 asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Defined contribution and defined benefit retirement - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Non cash defined benefit plan termination loss		$ 6.2
Defined contribution plan expense		8.2	$ 8.0	$ 7.8
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Non cash defined benefit plan termination loss	$ 6.2
Expected contribution					$ 18.0
Defined benefit fair value of plan assets		462.9	429.6
Expect to recognize unrecognized actuarial gains (losses)		3.9	0.1
Defined Benefit Pension Plans \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit fair value of plan assets		292.1	264.8	320.5
Defined Benefit Pension Plans \| Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan benefit obligation		563.7	508.6	758.1
Defined benefit fair value of plan assets		422.6	390.5	$ 481.5
Net underfunded status		$ 141.1	$ 118.1
Discount rate		3.40%	3.90%
Long-term return on plan assets		4.60%	2.50%	2.40%
Defined Benefit Pension Plans \| Canada \| Equity Securities \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation		10.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation		98.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation		90.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation		100.00%
Defined Benefit Pension Plans \| Norway \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation				14.00%
Defined Benefit Pension Plans \| Norway \| Equity Securities
Defined Benefit Plan Disclosure [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 Plan Disclosure [Line Items]
Long-term return on plan assets		4.00%
Percentage of plan asset allocation		63.00%
Defined Benefit Pension Plans \| Norway \| Real Estate.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit fair value of plan assets		$ 6.6	$ 7.8
Long-term return on plan assets		6.00%
Percentage of plan asset allocation		14.00%
Defined Benefit Pension Plans \| Norway \| Real Estate. \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit fair value of plan assets		$ 6.6	7.8
Defined Benefit Pension Plans \| Norway \| Other Investments And Liquid Funds
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets		7.00%
Defined Benefit Pension Plans \| United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan benefit obligation		$ 42.7	43.4	$ 58.0
Defined benefit fair value of plan assets		40.3	39.1	$ 52.4
Net underfunded status		$ 2.4	$ 4.3
Discount rate		5.00%	5.30%
Long-term return on plan assets		5.00%	4.00%	4.00%
Defined Benefit Pension Plans \| United States \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets		7.00%
Percentage of plan asset allocation		33.00%
Defined Benefit Pension Plans \| United States \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets		5.00%
Percentage of plan asset allocation		59.00%