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Segment and Georgraphic Data - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |
Asset Impairment Charges | $ 27.1 | $ 153.3 | $ 2.1
Consolidated operating income | $ 628.0 | 45.8 | 427.4
Number of reporting segments | 2 |  |
Insurance Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset Impairment Charges |  | 57.1 | 0.0
Consolidated operating income | $ (12.4) | (68.7) | 40.1
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset Impairment Charges | (1.1) | 5.2 | (0.2)
Consolidated operating income | 68.1 | (62.9) | 32.5
Front Street Re (Delaware) Ltd. [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Consolidated operating income | $ 59.7 | $ (115.4) | $ 45.1

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