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Employee Benefit Plans (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred compensation arrangements [Abstract] |  |
Deferred compensation plan, maximum deferral percentage | 100.00% |
Assets held-in-trust | $ 130.9 | $ 109.7
Unfunded liabilities | $ 151.6 | 136.3
Executive and management supplemental benefit plans compensation period | 5 years |
Revision of Prior Period Adjustment |  |
Deferred compensation arrangements [Abstract] |  |
Additional unfunded deferred compensation | $ 7.5 | $ 9.5
Savings Plan |  |
Deferred compensation arrangements [Abstract] |  |
Common stock, outstanding | 1.4 | 1.6
Percentage of plan shares in total shares outstanding | 1.40% | 1.50%
Unfunded Supplemental Benefit Plans |  |
Deferred compensation arrangements [Abstract] |  |
Cash contribution to plans during the next 12 months | $ 16.2 |
Unfunded Supplemental Benefit Plans | Maximum |  |
Deferred compensation arrangements [Abstract] |  |
Maximum benefit rate of final average compensation under non qualified plan | 30.00% |
Unfunded Supplemental Benefit Plans | Minimum |  |
Deferred compensation arrangements [Abstract] |  |
Maximum benefit rate of final average compensation under non qualified plan | 15.00% |
Defined Benefit Pension And Supplemental Benefit Plans |  |
Deferred compensation arrangements [Abstract] |  |
Net actuarial loss expected to be amortized from accumulated comprehensive income/loss into net periodic loss in next fiscal year | $ 2.3 |

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- Definition Defined contribution plan, number of shares of equity securities issued by employer and related parties included in plan assets. + References No definition available. + Details
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- Definition Defined contribution plan, number of shares of equity securities issued by employer and related parties included in plan assets as a percentage of total employer shares outstanding. + References No definition available. + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -SubTopic 10 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483043/710-10-30-1 + Details
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