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Income Taxes - Components of Deferred Income Tax assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Deferred tax assets: |  |
Other long-term liabilities | $ 57.3 | $ 127.0
Losses and credits | 61.5 | 34.8
Accrued warranty | 16.3 | 15.8
Other current liabilities | 24.5 | 17.7
Payroll-related obligations | 26.2 | 18.5
Other | 8.9 | 6.0
Gross deferred tax assets | 194.7 | 219.8
Less valuation allowance | (6.2) | (17.4)
Deferred tax assets, net | 188.5 | 202.4
Deferred tax liabilities: |  |
Intangible assets | (51.6) | (42.2)
Property, plant and equipment | (143.9) | (55.9)
Inventories | (18.0) | (18.6)
Other | (40.6) | (7.1)
Deferred tax liabilities | (254.1) | (123.8)
Net deferred tax liabilities | (65.6) |
Net deferred tax assets | $ 8.3 | $ 78.6

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