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Segment Data - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | $ 117.7 | $ 99.8
Number of reporting segments | 2 |
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | $ 2.3 | (19.0)
Insurance Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | (15.4) | 0.0
Front Street Re (Delaware) Ltd. [Member] | Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | $ (3.2) | $ (17.1)

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Details
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- Details
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