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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |  |
Income (loss) before noncontrolling interests, Domestic | $ 193.4 | $ 268.0 | $ 1,500.0 |
Income (loss) before noncontrolling interests, Foreign | $ 81.0 | $ 57.7 | $ 93.1 |
Federal income tax rates | 21.00% | 21.00% | 21.00% |
Effective income tax rates | 21.50% | 18.70% | 23.90% |
Tax benefits recorded | $ 0.7 | $ 2.4 | $ 0.8 |
Foreign tax credit carryover net of valuation allowance | 2.8 |  |  |
Operating loss carryforwards, amount | 180.5 |  |  |
Operating loss carryforwards, indefinite expiration, amount | 95.5 |  |  |
Operating loss carryforwards, subject to expiration, amount | $ 85.0 |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2028 |  |  |
Deferred tax asset valuation allowance | $ 13.7 | 7.4 |  |
Liability for income taxes associated with uncertain tax positions | 12.4 | 3.2 | 7.9 | $ 7.2
Offsetting tax benefits related to uncertain tax positions | 0.8 | 2.2 | 2.9 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0.8 | 0.0 | $ 0.0 |
Minimum income tax on certain large corporations percentage as part of Inflation Reduction Act | 15.00% |  |  |
Excise tax percentage on corporate stock repurchases as part of Inflation Reduction Act | 1.00% |  |  |
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 | $ 9.6 |  |  |
Deferred Tax Assets Valuation Allowances On Net Operating Loss Carryforwards |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax asset valuation allowance | 3.0 | 5.7 |  |
Deferred Tax Assets Valuation Allowances On Other Deferred Tax Assets |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax asset valuation allowance | 1.1 | $ 1.7 |  |
Federal |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards, amount | 69.5 |  |  |
State and Local Jurisdiction |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards, amount | 100.6 |  |  |
Foreign Tax Authority |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Operating loss carryforwards, amount | $ 10.4 |  |  |

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