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Retirement Benefits - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions by employer | $ 0.1 |  |
Participants affected due to plan freeze | employee |  |  | 60
Funded percentage | 105.00% |  |
Defined benefit plan, assets | $ 89.1 |  |
Defined benefit plan, liability | $ 84.6 |  |
Other (Income) Expense Net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement loss recognized |  | $ 0.3 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year |  | 3.0 |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year |  | $ 1.1 |

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