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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 137.3 | $ 108.4 | $ 228.1 | $ 197.4 |
Effective tax rate (percent) | 22.10% | 23.40% | 19.90% | 23.50% |
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | $ 6.6 |  | $ 39.5 |  |
Deferred tax assets net of DTL | 167.3 |  | 167.3 |  | $ 181.8
Valuation allowance for deferred income taxes | $ 17.8 |  | $ 17.8 |  | $ 18.7

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