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Segment Data - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 143.5 | $ 142.5 | $ 261.2 | $ 242.3
Number of reporting segments |  |  | 2 |
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 13.5 | 12.8 | $ 15.8 | (6.2)
Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (4.1) | (1.4) | (19.5) | (1.4)
Front Street Re (Delaware) Ltd. [Member] | Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 13.1 | $ 13.9 | $ 9.9 | $ (3.2)

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