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Fair Value Measurements Fair Value Measurement (Details 2) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 805.6 $ 661.8 $ 617.3 $ 977.4
Notes Payable 3,821.1 3,682.8    
Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 766.7 632.5    
Restricted Cash and Cash Equivalents 11.7 10.0    
Notes Payable 3,373.1 3,323.6    
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure [1] 766.7 632.5    
Other Assets, Fair Value Disclosure [1] 11.7 10.0    
Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure [1] 766.7 632.5    
Other Assets, Fair Value Disclosure [1] 11.7 10.0    
Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 38.9 29.3    
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 Disclosure [1] 38.9 29.3    
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure [1] 448.0 359.2    
Financial Services [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure [1] 448.0 359.2    
Cash and Cash Equivalents, Fair Value Disclosure [1] 38.9 29.3    
Line of Credit [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Line of Credit Facility, Amount Outstanding 0.0 300.0    
Line of Credit [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding   300.0    
Line of Credit [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding   300.0    
Senior Notes [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 3,342.7 3,000.2    
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 Disclosure [2] 3,393.8 3,033.8    
Senior Notes [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure [2] 3,393.8 3,033.8    
Secured Debt [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 30.4 23.4    
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 Disclosure [2] 30.4 23.4    
Secured Debt [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure [2] $ 30.4 $ 23.4    
[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.