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v3.23.2

Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension Plan, Defined Benefit [Member] |  |  |  |
Service costs | $ 0.8 | $ 0.6 | $ 1.5 | $ 1.3
Interest costs | 6.9 | 4.8 | 13.9 | 9.6
Amortization of prior service costs (credits), net | 0.0 | (0.1) | (0.1) | (0.1)
Expected return on plan assets (gains) | (7.8) | (8.9) | (15.5) | (17.8)
Net periodic benefit cost (credit) | (0.1) | (3.6) | (0.2) | (7.0)
Postretirement Health and Life Benefits Plans [Member] |  |  |  |
Interest costs | 1.3 | 0.9 | 2.5 | 1.8
Amortization of prior service costs (credits), net | 0.0 | (0.1) | 0.0 | (0.1)
Net periodic benefit cost (credit) | $ 1.3 | $ 0.8 | $ 2.5 | $ 1.7

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