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Summary of Significant Accounting Policies - Schedule of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive (loss) income | $ (95.5) | $ (38.4) | $ 106.4
Correction of Error |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive (loss) income | (10.7) |  |
Recorded Amount Prior to Error Correction |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive (loss) income | $ (84.8) |  |

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