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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Income tax on unrealized appreciation (depreciation) on securities before reclassification | $ 0.0 | $ 0.0 | $ 3.3
Income tax on minimum pension liability adjustments | $ 0.8 | $ (3.5) | $ 1.9

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