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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer |  | $ 2.6
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 |  | 4.4
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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