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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2012 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Payments to Acquire Other Investments |  |  | $ 18.6 |  | $ 14.8 |  |
Payments to Acquire Land |  | $ 19.9 |  |  |  |  |
Proceeds from sale (purchases) of debt securities collateralized by residential real estate |  |  |  | $ 35.8 | (14.8) |  |
Gain on sale of debt securities collateralized by residential real estate |  |  |  | 4.5 | 0.0 |  |
Homebuilding [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Debt securities collateralized by residential real estate |  |  |  | 0.0 |  | $ 33.9 |
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Debt securities collateralized by residential real estate | [1] | 35.6 |  | 0.0 | 35.6 | 33.9 | $ 20.8
Financial Services [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Mortgage loans held for sale |  |  |  | 634.5 |  | 631.0 |
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Mortgage loans held for sale | [2] | 13.5 |  | 14.4 | 13.5 | $ 13.9 | $ 12.0
Land [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Payments to Acquire Land |  | 5.1 |  |  |  |  |
Debt Securities [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Payments to Acquire Land |  | $ 14.8 |  |  |  |  |
Debt Securities [Member] | Homebuilding [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description | [1] |  |  | 2.2 | 0.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  |  | 0.0 | 14.8 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  | (35.8) | 0.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  | (0.3) | 0.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | [2] |  |  | 0.0 | 0.0 |  |
Loans Receivable [Member] | Financial Services [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description | [2] |  |  | 1.2 | 0.3 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  |  | 0.0 | 0.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [2] |  |  | (15.6) | (1.7) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  | 0.0 | 0.0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | [2] |  |  | $ 14.9 | $ 2.9 |  |
[1] | In October 2012, the Company purchased defaulted debt securities, which were secured by residential real estate, for $18.6 million in cash. In fiscal 2015, the Company purchased the residential real estate parcel and all additional defaulted debt securities associated with the parcel for $19.9 million in cash, of which $5.1 million was allocated to the land and $14.8 million was allocated to the debt securities. The Company sold all of the debt securities to a third party for $35.8 million in January 2016. The resulting gain of $4.5 million on the sale is included in homebuilding other income in the consolidated statement of operations for the nine-month period ended June 30, 2016.
[2] | Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other income. Mortgage loans held for sale at June 30, 2016 and September 30, 2015 include $14.4 million and $13.9 million, respectively, of loans for which the Company elected the fair value option upon origination and which the Company did not sell into the secondary market. Mortgage loans held for sale totaling $14.9 million and $2.9 million were transferred to Level 3 during the nine months ended June 30, 2016 and 2015, respectively, due to significant unobservable inputs used in determining the fair value of the loans. The fair value of these mortgage loans held for sale is generally calculated considering the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk.

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- Definition The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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