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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (PBO and ABO for Pension Plan and for Postretirement Benefit Plan) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
PBO of plan assets for pension plan with plan assets in excess of its ABO | $ 21.5 | $ 21.0
PBO of plan assets for pension plan with plan assets in excess of its PBO | 21.5 | 21.0
ABO of plan assets for pension plan with plan assets in excess of its PBO | 21.5 | 21.0
ABO of plan assets for pension plan with plan assets in excess of its ABO | 21.5 | 21.0
Fair value of the plan assets for pension plan with plan assets in excess of its PBO | 26.7 | 26.3
Fair value of the plan assets for pension plan with plan assets in excess of its ABO | 26.7 | 26.3
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
PBO of plan assets for pension plan with plan assets in excess of its ABO | (1.6) | (1.4)
PBO of plan assets for pension plan with plan assets in excess of its PBO | (1.6) | (1.4)
ABO of plan assets for pension plan with plan assets in excess of its PBO | (1.6) | (1.4)
ABO of plan assets for pension plan with plan assets in excess of its ABO | (1.6) | (1.4)
Fair value of the plan assets for pension plan with plan assets in excess of its PBO | 0.0 | 0.0
Fair value of the plan assets for pension plan with plan assets in excess of its ABO | $ 0.0 | $ 0.0

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- Definition Defined Benefit Plan, Pension Plan With Plan Assets In Excess Of Projected Benefit Obligation, Projected Benefit Obligation + References No definition available. + Details
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- Details
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