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Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Deferred tax assets:    
Inventory costs $ 63.5 $ 37.6
Inventory impairments 12.7 21.5
Warranty and construction defect costs 190.5 156.7
Net operating loss carryforwards 11.7 17.5
Tax credit carryforwards 1.6 2.1
Incentive compensation plans 77.5 68.3
Other 15.6 15.6
Total deferred tax assets 373.1 319.3
Valuation allowance (4.2) (7.5)
Total deferred tax assets, net of valuation allowance 368.9 311.8
Deferred tax liabilities:    
Deferral of profit on home closings 166.7 131.9
Depreciation of fixed assets 14.4 19.0
Other 32.5 16.0
Total deferred tax liabilities 213.6 166.9
Deferred income taxes, net $ 155.3 $ 144.9