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v3.23.3

Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | $ (0.9) | $ 0.0 | $ (0.9) | $ 0.0
Pension Plan, Defined Benefit [Member] |  |  |  |
Service costs | 0.7 | 0.7 | 2.2 | 2.0
Interest costs | 6.9 | 4.7 | 20.8 | 14.3
Amortization of prior service costs (credits), net | 0.0 | (0.1) | (0.1) | (0.2)
Expected return on plan assets (gains) | (7.7) | (8.9) | (23.2) | (26.7)
Net periodic benefit cost (credit) | (1.0) | (3.6) | (1.2) | (10.6)
Postretirement Health and Life Benefits Plans [Member] |  |  |  |
Interest costs | 1.2 | 0.9 | 3.7 | 2.7
Amortization of prior service costs (credits), net | (0.1) | 0.0 | (0.1) | (0.1)
Net periodic benefit cost (credit) | $ 1.1 | $ 0.9 | $ 3.6 | $ 2.6

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