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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Income Tax Disclosure [Abstract]          
Income tax expense $ 155.5 $ 128.8 $ 391.4 $ 317.8  
Effective tax rate (percent) 35.00% 34.00% 35.10% 34.50%  
Increase (Decrease) in Income Taxes Payable $ (58.2)        
Increase (Decrease) in Deferred Income Taxes (63.5)   $ (92.0) $ (46.7)  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 5.3        
Deferred tax assets net of DTL 394.1   394.1   $ 486.6
Homebuilding [Member]          
Income Tax Contingency [Line Items]          
Valuation allowance for deferred income taxes $ 10.4   $ 10.4   $ 10.3