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Employee Benefit Plans (Principal Components of Employee Benefit Costs) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Benefit Plan Disclosure [Line Items] |  |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | $ 73.6 | $ 34.8 | $ 108.7
Savings Plan |  |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |  |
Savings plan |  | 34.5 | 37.3 | 73.7
Unfunded Supplemental Benefit Plans |  |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |  |
Employee benefit plan expenses |  | 12.3 | 12.2 | 10.6
Other Plans, Net |  |  |  |
Employee Benefit Plan Disclosure [Line Items] |  |  |  |
Other plans, net | [1] | $ 26.8 | $ (14.7) | $ 24.4
[1] | For the year ended December 31, 2022, participant investments included in the deferred compensation plan realized losses in excess of expenses recorded by the Company.

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- Definition Employee benefit plan disclosure line items. + References No definition available. + Details
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- Definition Savings and deferred compensation plans expense. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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- Definition Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
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- Details
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- Details
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- Details
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