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 included in accumulated other comprehensive (income) loss for prior service cost (credit) 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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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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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$ 8.0	$ 7.8	$ 6.6
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution				$ 18.0
Defined benefit fair value of plan assets	429.6	533.9
Expect to recognize unrecognized actuarial gains (losses)	3.8
Expect to recognize prior service credit\cost	0.1
Defined Benefit Pension Plans \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit fair value of plan assets	264.8	320.5	314.8
Defined Benefit Pension Plans \| Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan benefit obligation	508.6	758.1	855.8
Defined benefit fair value of plan assets	390.5	481.5	$ 494.8
Net underfunded status	$ 118.1	$ 276.6
Discount rate	3.90%	1.50%
Long-term return on plan assets	2.50%	2.40%	2.00%
Defined Benefit Pension Plans \| U.K.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan benefit obligation	$ 7.8
Defined benefit fair value of plan assets	9.3
Defined benefit pension plan assets	$ 1.5
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 \| Equity Securities \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	20.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	80.00%
Defined Benefit Pension Plans \| Canada \| Fixed Income Funds \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation	90.00%
Defined Benefit Pension Plans \| Norway \| Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Percentage of plan asset allocation			17.00%
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	15.00%
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	62.00%
Defined Benefit Pension Plans \| Norway \| Real Estate.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit fair value of plan assets	$ 7.8	$ 9.1
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	$ 7.8	9.1
Defined Benefit Pension Plans \| Norway \| Other Investments And Liquid Funds
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets	4.00%
Defined Benefit Pension Plans \| United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan benefit obligation	$ 43.4	58.0	$ 63.2
Defined benefit fair value of plan assets	39.1	52.4	$ 53.3
Net underfunded status	$ 4.3	$ 5.6
Discount rate	5.30%	2.60%
Long-term return on plan assets	4.00%	4.00%	4.50%
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	34.00%
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%