Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Income (loss) before noncontrolling interests, Domestic	$ 83.2	$ 268.0	$ 193.4
Income (loss) before noncontrolling interests, Foreign	$ 81.0	$ 82.2	$ 57.7
Federal income tax rates	21.00%	21.00%	21.00%
Effective income tax rates	19.80%	21.50%	18.70%
Minimum tax rate in jurisdictions which it operates percentage	15.00%
Tax benefits recorded	$ 0.3	$ 0.7	$ 2.4
Foreign tax credit carryover net of valuation allowance	3.2
Operating loss carryforwards, amount	383.1
Operating loss carryforwards, indefinite expiration, amount	68.1
Operating loss carryforwards, subject to expiration, amount	$ 315.0
Operating loss carryforwards expiration date	Dec. 31, 2028
Deferred tax asset valuation allowance	$ 27.9	13.7
Liability for income taxes associated with uncertain tax positions	31.6	12.4	3.2	$ 7.9
Offsetting tax benefits related to uncertain tax positions	$ 3.7	0.8	$ 2.2
Unrecognized tax positions increase decrease, months	It is reasonably possible that the unrecognized benefit with respect to certain of the Company’s unrecognized tax positions may increase or decrease within the next 12 months. Any such change may be the result of either ongoing audits or the expiration of federal and state statutes of limitations for the assessment of taxes.
Deferred Tax Assets Valuation Allowances on Capital Losses
Income Tax Disclosure [Line Items]
Deferred tax asset valuation allowance	$ 24.7	9.6
Deferred Tax Assets Valuation Allowances On Net Operating Loss Carryforwards
Income Tax Disclosure [Line Items]
Deferred tax asset valuation allowance	2.9	3.0
Deferred Tax Assets Valuation Allowances On Other Deferred Tax Assets
Income Tax Disclosure [Line Items]
Deferred tax asset valuation allowance	0.3	$ 1.1
Federal
Income Tax Disclosure [Line Items]
Operating loss carryforwards, amount	38.4
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Operating loss carryforwards, amount	332.7
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Operating loss carryforwards, amount	$ 12.0