Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 3 Months Ended | ||||||||||||||||||||
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Mar. 31, 2014
Homebuilding [Member]
|
Sep. 30, 2013
Homebuilding [Member]
|
Mar. 31, 2014
Homebuilding [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
|
Sep. 30, 2013
Homebuilding [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
|
Mar. 31, 2014
Financial Services [Member]
|
Sep. 30, 2013
Financial Services [Member]
|
Mar. 31, 2014
Financial Services [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
|
Sep. 30, 2013
Financial Services [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
|
Mar. 31, 2014
Debt Securities [Member]
Homebuilding [Member]
|
Mar. 31, 2014
Loans Receivable [Member]
Financial Services [Member]
|
Mar. 31, 2014
Minimum [Member]
Inventories [Member]
Homebuilding [Member]
|
Mar. 31, 2013
Minimum [Member]
Inventories [Member]
Homebuilding [Member]
|
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||||||||||||||||||||
Fair Value Inputs, Discount Rate | 14.00% | 14.00% | ||||||||||||||||||||
Other Investments | $ 20.8 | $ 20.3 | $ 20.8 | [1] | $ 20.3 | [1] | ||||||||||||||||
Mortgage loans held for sale | 342.5 | 395.1 | 6.7 | [2] | 5.7 | [2] | ||||||||||||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description | 0.5 | [1] | 0.1 | [2] | ||||||||||||||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] | 0 | [2] | ||||||||||||||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [1] | 0 | [2] | ||||||||||||||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [2] | (0.3) | [2] | ||||||||||||||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $ 0 | [2] | $ 1.2 | [2] | ||||||||||||||||||
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