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Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Entity Information [Line Items] |  |  |  |  |
Cash and cash equivalents, Carrying value | $ 1,224.1 | $ 1,224.1 | $ 993.2 | $ 1,303.2 | $ 1,383.8
Subsidiaries [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Cash and cash equivalents, Carrying value |  |  | $ 39.4 | $ 40.5 |
Other Segments [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
General and administrative expense | 0.8 | 2.5 |  |  |
Other income | $ 2.0 | $ 3.7 |  |  |

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