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Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Deferred tax assets:    
Inventory costs $ 42.6 $ 87.6
Inventory impairments 83.9 128.3
Warranty and construction defect costs 163.7 138.8
Net operating loss carryforwards 26.2 40.1
Tax credit carryforwards 2.5 2.9
Incentive compensation plans 92.6 82.2
Deferral of profit on home sales 1.7 2.2
Other 13.9 11.1
Total deferred tax assets 427.1 493.2
Valuation allowance (11.2) (10.3)
Total deferred tax assets, net of valuation allowance 415.9 482.9
Deferred Tax Liabilities, Tax Deferred Income 41.6 0.0
Deferred Tax Liabilities, Other 9.3 6.6
Other 50.9 6.6
Deferred income taxes, net $ 365.0 $ 476.3