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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in Computation of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Prior Service Costs |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | $ 0.2 | $ 0.8 | $ 0.9 | $ 0.7
Settlement |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax |  | 33.6 |  |
Actuarial (Gains) Losses |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 0.3 | 1.3 | 5.2 | 3.1
Employee Pension and Postretirement Benefits, Net of Tax |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 0.5 | 35.7 | 6.1 | 3.8
Tax benefit | (0.1) | (8.3) | (1.5) | (1.0)
Net of tax | $ 0.4 | $ 27.4 | $ 4.6 | $ 2.8

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