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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) on Condensed Consolidated Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Prior Service Costs |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.2
Actuarial (Gains) Losses |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 0.8 | 0.1 | 1.5 |
Employee Pension and Postretirement Benefits, Net of Tax |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | 0.9 | 0.3 | 1.8 | 0.2
Tax provision (benefit) | (0.2) | (0.2) | (0.4) | (0.1)
Net of tax | $ 0.7 | $ 0.1 | $ 1.4 | $ 0.1

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