Pension - Schedule of Change in Plan Assets and Underfunded Status at End of Year (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets
Company contributions	$ 0	$ 0	$ 0
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	8,600,000	249,600,000	$ 266,700,000
Actual return on plan assets	14,200,000	200,000
Benefits paid	(16,900,000)	(17,400,000)
Settlements	(238,500,000)	(600,000)
Company contributions	200,000	700,000
Fair value of plan assets at end of year	249,600,000	266,700,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 1,000,000.0	$ (8,900,000)