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Investments - Net Investment Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 236.8 | $ 217.7 | $ 701.7 | $ 632.8
External investment expense | (5.2) | (6.8) | (14.3) | (14.3)
Net investment income | 231.6 | 210.9 | 687.4 | 618.5
Fixed maturity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 209.6 | 192.1 | 623.8 | 568.1
Equity available-for-sale securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 10.2 | 7.1 | 27.9 | 16.7
Asset based loan receivables [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | 9.7 | 16.7 | 36.2 | 44.5
Other investments [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross investment income | $ 7.3 | $ 1.8 | $ 13.8 | $ 3.5

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