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Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits, beginning of period | $ 33.1 | $ 35.7 | $ 8.2
Increases related to tax positions from prior years | 0.0 | 0.1 | 0.6
Decreases related to tax positions from prior years | 0.0 | (2.1) | (0.6)
Increases related to tax positions taken during the current year |  | 0.0 | 27.7
Increases related to tax positions taken during the current year | 0.0 |  |
Lapses of statutes of limitation | (0.3) | (0.6) | (0.2)
Unrecognized tax benefits, end of period | 32.8 | 33.1 | $ 35.7
Accrual for tax interest and penalties | $ 6.5 | $ 1.8 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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