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Reinsurance - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Oct. 31, 2014 | Sep. 30, 2014
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Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Contractholder funds | $ 17,703.9 |  | $ 16,463.5
Ability Re [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | $ 368.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance Reserves |  | $ 346.9 |

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The total liability as of the balance sheet date of amounts due policy holders, excluding future policy benefits and claims, including unpaid policy dividends, retrospective refunds, and undistributed earnings on participating business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13,14) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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