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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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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Defined contribution and defined benefit retirement plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined contribution benefit plan expense	$ 4.1	$ 3.9	$ 3.9
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions next fiscal year	17.0
Settlements	1.3
Defined benefit pension plans \| U S
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 0.8	$ 1.2
Discount rate	5.00%	5.30%
Expected long-term rate of return	5.00%	4.00%	4.00%
Defined benefit pension plans \| U S \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Target asset allocation	33.00%
Defined benefit pension plans \| U S \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	5.00%
Target asset allocation	59.00%
Defined benefit pension plans \| U S \| Assets valued at NAV
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	98.00%
Defined benefit pension plans \| Foreign Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan funded status of plan	$ 141.1	$ 119.2
Discount rate	3.40%	3.90%
Expected long-term rate of return	4.60%	2.50%	2.40%
Defined benefit pension plans \| C A \| Equity Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	10.00%
Defined benefit pension plans \| C A \| Debt Securities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	90.00%
Defined benefit pension plans \| C A \| Debt Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	100.00%
Defined benefit pension plans \| N O \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Target asset allocation	18.00%
Defined benefit pension plans \| N O \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	4.00%
Target asset allocation	63.00%
Defined benefit pension plans \| N O \| Real Estate
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	6.00%
Target asset allocation	14.00%
Defined benefit pension plans \| N O \| Other Investment Securities And Cash
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return	7.00%
Defined benefit pension plans \| N O \| Real Estate And Other Investments
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation	14.00%