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Fair Value Measurements Fair Value Measurement (Details 2) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 1,150.5 $ 1,047.7 $ 679.8 $ 732.6
Restricted Cash and Cash Equivalents 54.5 49.3    
Notes Payable 3,273.0 2,493.1    
Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 1,127.7 1,030.4    
Restricted Cash and Cash Equivalents 54.5 49.3    
Notes Payable 3,027.2 2,305.3    
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 1,127.7 1,030.4    
Restricted Cash, Fair Value Disclosure 54.5 49.3    
Homebuilding [Member] | Estimated Fair Value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 1,127.7 [1] 1,030.4 [1]    
Restricted Cash, Fair Value Disclosure 54.5 [1] 49.3 [1]    
Financial Services [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 22.8 17.3    
Mortgage repurchase facility, maturing 2014 245.8 187.8    
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 22.8 17.3    
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage Repurchase Facility Liability, Fair Value Disclosure 245.8 187.8    
Financial Services [Member] | Estimated Fair Value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 22.8 [1] 17.3 [1]    
Mortgage Repurchase Facility Liability, Fair Value Disclosure 245.8 [1] 187.8 [1]    
Senior Notes [Member] | Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 2,554.7 [2] 1,854.2 [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 2,654.1 [2] 1,973.9 [2]    
Senior Notes [Member] | Homebuilding [Member] | Estimated Fair Value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure 2,654.1 [2] 1,973.9 [2]    
2% convertible senior notes [Member] | Homebuilding [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 462.4 447.0    
2% convertible 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 941.9 [2] 821.2 [2]    
2% convertible senior notes [Member] | Homebuilding [Member] | Estimated Fair Value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure $ 941.9 [2] $ 821.2 [2]    
[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, which is classified as Level 2 within the fair value hierarchy.