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Contingencies - Litigation and Other Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015
DPA And HUD |  |  |
Loss Contingencies [Line Items] |  |  |
Company's liability under Deferred Prosecution Agreement (percent) | 4.00% | 4.00% |
Maximum liability under the DPA and other settlement agreements | $ 48.0 | $ 48.0 |
Portion of liability under DPA that has been paid as of balance sheet date |  | 28.1 |
Deferred prosecution agreement accrual | 6.2 | 6.2 |
Loss contingency accrual provision | 1.9 | 4.2 |
Legal Reserve |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued amounts for litigation and other contingent liabilities | 9.1 | 9.1 | $ 12.6
Performance Bonds |  |  |
Loss Contingencies [Line Items] |  |  |
Letters of credit secured using cash collateral | 45.5 | 45.5 |
Outstanding performance bonds | $ 190.4 | $ 190.4 |

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