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v3.23.1

Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Pension and other postretirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 7.1 | $ 9.5
Interest cost | 18.3 | 10.4
Expected return on plan assets | (16.4) | (16.6)
Amortization of prior service costs | 0.0 | 0.1
Recognized net actuarial gains | (5.0) | 0.0
Net periodic benefit cost | $ 4.0 | 3.4
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amortization of prior service costs |  | $ (0.1)

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