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Pension and Postretirement Benefit Plans (Weighted Average Asset Allocation) (Details) - Pension plan | Dec. 31, 2023 | Dec. 31, 2022
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U.S. |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 100.00% | 100.00%
U.S. | Equity securities |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 0.00% | 10.00%
U.S. | Fixed income securities |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 89.00% | 79.00%
U.S. | Other investments |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 11.00% | 11.00%
U.K |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 100.00% | 100.00%
U.K | Equity securities |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 11.00% | 11.00%
U.K | Fixed income securities |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 82.00% | 80.00%
U.K | Other investments |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |
Asset allocation | 7.00% | 9.00%

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