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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - Pension Benefits - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Components of net pension expense: |  |  |  |
Service cost | $ 1.5 | $ 1.9 | $ 3.0 | $ 3.8
Interest cost | 3.5 | 2.8 | 7.1 | 5.6
Expected return on plan assets | (7.5) | (7.8) | (15.0) | (15.6)
Amortization of prior service cost | 0.4 | 0.5 | 0.7 | 1.0
Amortization of net actuarial losses | 4.0 | 6.2 | 8.1 | 12.4
Net pension expense | 1.9 | $ 3.6 | 3.9 | $ 7.2
United States |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Estimated future employer contribution in fiscal year | $ 0.0 |  | $ 0.0 |
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |  |
Expected long-term return on assets (as a percent) |  |  | 5.50% |

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