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Fair Value Measurement (Details 2) - USD ($)
$ in Millions
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value $ 1,268.7 $ 1,383.8 $ 541.0 $ 661.8
Notes payable, Carrying value 3,734.3 3,811.5    
Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value 1,245.7 1,355.9    
Restricted cash, Carrying value 9.7 9.7    
Notes payable, Carrying value 3,337.2 3,333.6    
Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 1,245.7 1,355.9    
Restricted cash, Fair value [1] 9.7 9.7    
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 1,245.7 1,355.9    
Restricted cash, Fair value [1] 9.7 9.7    
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Restricted cash, Fair value [1] 0.0 0.0    
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Restricted cash, Fair value [1] 0.0 0.0    
Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value 23.0 27.9    
Mortgage repurchase facility 397.1 477.9    
Financial Services [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 23.0 27.9    
Mortgage repurchase facility, Fair value [1] 397.1 477.9    
Financial Services [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 23.0 27.9    
Mortgage repurchase facility, Fair value [1] 0.0 0.0    
Financial Services [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Mortgage repurchase facility, Fair value [1] 0.0 0.0    
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Mortgage repurchase facility, Fair value [1] 397.1 477.9    
Senior Notes [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Carrying value 3,326.6 3,325.5    
Senior Notes [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 3,394.3 3,405.9    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 3,394.3 3,405.9    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Carrying value 10.6 8.1    
Secured Debt [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 10.6 8.1    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] $ 10.6 $ 8.1    
[1] The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] The fair value is determined based on quoted market prices of recent transactions of the notes, which is classified as Level 2 within the fair value hierarchy.