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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 3.9 |
Actuarial loss |  | $ 9.7
Deferred pension cost (reversal of cost) |  | 10.7
Increase in plan assets |  | $ 1.0
Other current assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, assets | 0.8 |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | 4.0 |
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | $ 1.2 |

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