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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  | (671.10%) | 18.00% |
Discrete income tax (benefit) | $ (1.1) | $ (0.2) | $ (0.4) | $ (0.1) | $ (1.3) |  |
Percentage points that reduced effective tax rate |  |  |  |  | (714.0) | (19.1) |
Unrecognized tax benefits that would impact effective tax rate | 2.0 |  |  |  | 2.0 |  |
Income tax penalties and interest accrued | 0.4 |  |  |  | 0.4 |  | 0.6
Accumulated undistributed foreign earnings | 25.7 |  |  |  | 25.7 |  |
Minimum [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Estimated unrecognized deferred tax liability | 1.5 |  |  |  | 1.5 |  |
Maximum [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Estimated unrecognized deferred tax liability | $ 2.5 |  |  |  | $ 2.5 |  |

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