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Retirement Benefits - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2019 employee
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions by employer | $ 3.3 |
Participants affected due to plan freeze (fewer than) | employee |  | 60
Recognized loss | 9.7 |
Previously deferred pension cost | 10.7 |
Increase in plan assets | 1.0 |
Funded status of plan | 10.9 |
Equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Trading securities | 1.1 |
Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Trading securities | 9.8 |
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | 3.4 |
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year | $ 1.0 |

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