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v3.23.2

Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Components of net pension expense: |  |  |  |
Service cost | $ 1.8 | $ 1.5 | $ 3.7 | $ 3.0
Interest cost | 6.5 | 3.5 | 13.0 | 7.1
Expected return on plan assets | (7.3) | (7.5) | (14.6) | (15.0)
Amortization of prior service cost | 0.5 | 0.4 | 0.9 | 0.7
Amortization of net actuarial losses | 0.5 | 4.0 | 1.1 | 8.1
Net pension expense | 2.0 | $ 1.9 | 4.1 | $ 3.9
United States |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Estimated future employer contribution in fiscal year | $ 0.0 |  | $ 0.0 |

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