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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  | Jun. 30, 2014 |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 |  | $ 79,300,000 |  | $ 0 |  | $ 79,300,000 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 755,600,000 |  | 419,000,000 |  | 523,500,000 |  | 206,000,000 |
Total Gains (Losses) Included in Earnings | 1,500,000 |  |  |  | 2,100,000 |  | (300,000) |
Total Gains (Losses) Included in AOCI | 15,900,000 |  | (10,800,000) |  | 20,500,000 |  | (9,600,000) |
Purchases | 191,000,000 |  | 106,300,000 |  | 425,300,000 |  | 394,700,000 |
Sales | (1,000,000) |  |  |  | (1,000,000) |  | (9,600,000) |
Settlements | (13,500,000) |  | (11,800,000) |  | (15,900,000) |  | (25,500,000) |
Net transfer In (Out) of Level 3 (a) | (18,900,000) | [1],[2] |  | [1] | (23,900,000) | [1],[2] | (53,000,000) | [1]
Balance at End of Period | 930,600,000 |  | 502,700,000 |  | 930,600,000 |  | 502,700,000 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 2,234,500,000 |  | 1,842,300,000 |  | 1,875,200,000 |  | 1,782,800,000 |
Total Gains (Losses) Included in Earnings | 112,900,000 |  | (106,300,000) |  | 340,900,000 |  | (46,800,000) |
Total Gains (Losses) Included in AOCI | 0 |  |  |  | 0 |  |  |
Purchases | 0 |  | 0 |  | 150,600,000 |  |  |
Sales | 0 |  | 0 |  | 0 |  |  |
Settlements | (328,000,000) |  | (2,800,000) |  | (347,300,000) |  | (2,800,000) |
Net transfer In (Out) of Level 3 | 0 |  | 0 |  | 0 | [2] |  | [1]
Balance at End of Period | 2,019,400,000 |  | 1,733,200,000 |  | 2,019,400,000 |  | 1,733,200,000 |
FIA embedded derivatives, included in contractholder funds [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 1,718,700,000 |  | 1,639,600,000 |  | 1,544,400,000 |  | 1,550,800,000 |
Total Gains (Losses) Included in Earnings | 145,800,000 |  | (53,700,000) |  | 320,100,000 |  | 35,100,000 |
Total Gains (Losses) Included in AOCI |  |  | 0 |  |  |  |  |
Purchases |  |  | 0 |  |  |  |  |
Sales |  |  | 0 |  |  |  |  |
Settlements |  |  | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 |  | [2] | 0 |  |  | [2] |  | [1]
Balance at End of Period | 1,864,500,000 |  | 1,585,900,000 |  | 1,864,500,000 |  | 1,585,900,000 |
Front Street Future Policyholder Benefits Reserve [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 151,000,000 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in Earnings | 5,100,000 |  |  |  | 8,100,000 |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  | 0 |  |  |
Purchases |  |  |  |  | 150,600,000 |  |  |
Sales |  |  |  |  | 0 |  |  |
Settlements | (1,200,000) |  |  |  | (3,800,000) |  |  |
Net transfer In (Out) of Level 3 |  | [2] |  |  | 0 | [2] |  |
Balance at End of Period | 154,900,000 |  |  |  | 154,900,000 |  |  |
Equity conversion feature of preferred stock [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 364,800,000 |  | 202,700,000 |  | 330,800,000 |  | 232,000,000 |
Total Gains (Losses) Included in Earnings | (38,000,000) |  | (52,600,000) |  | 12,700,000 |  | (81,900,000) |
Total Gains (Losses) Included in AOCI |  |  | 0 |  |  |  |  |
Purchases |  |  | 0 |  |  |  |  |
Sales |  |  | 0 |  |  |  |  |
Settlements | (326,800,000) |  | (2,800,000) |  | (343,500,000) |  | (2,800,000) |
Net transfer In (Out) of Level 3 |  | [2] | 0 |  |  | [2] |  | [1]
Balance at End of Period |  |  | 147,300,000 |  |  |  | 147,300,000 |
Available-for-sale embedded derivatives [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  | 0 |  |  |  |  |
Asset-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 10,700,000 |  | 5,300,000 |  | 5,000,000 |  | 15,900,000 |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in AOCI | 0 |  | (100,000) |  | (300,000) |  | (200,000) |
Purchases | 0 |  |  |  | 5,000,000 |  |  |
Sales |  |  |  |  |  |  |  |
Settlements | 0 |  | (100,000) |  | 0 |  | (100,000) |
Net transfer In (Out) of Level 3 (a) | (4,800,000) | [2] |  | [1] | (3,800,000) | [2] | (10,500,000) | [1]
Balance at End of Period | 5,900,000 |  | 5,100,000 |  | 5,900,000 |  | 5,100,000 |
Commercial mortgage-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  | 6,200,000 |  | 5,700,000 |  | 5,000,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI | 100,000 |  | (300,000) |  | 400,000 |  | (100,000) |
Purchases | 83,800,000 |  |  |  | 83,800,000 |  | 1,000,000 |
Sales |  |  |  |  |  |  |  |
Settlements | 0 |  |  |  | 0 |  |  |
Net transfer In (Out) of Level 3 (a) |  | [2] |  | [1] | (6,000,000) | [2] |  | [1]
Balance at End of Period | 83,900,000 |  | 5,900,000 |  | 83,900,000 |  | 5,900,000 |
Corporates [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 657,000,000 |  | 356,500,000 |  | 461,100,000 |  | 135,300,000 |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 0 |  | (300,000) |
Total Gains (Losses) Included in AOCI | 14,400,000 |  | (12,000,000) |  | 18,400,000 |  | (10,800,000) |
Purchases | 88,900,000 |  | 106,200,000 |  | 283,200,000 |  | 383,600,000 |
Sales | (1,000,000) |  |  |  | (1,000,000) |  | (9,600,000) |
Settlements | 0 |  | (11,700,000) |  | (2,400,000) |  | (25,400,000) |
Net transfer In (Out) of Level 3 (a) | (14,100,000) | [2] |  | [1] | (14,100,000) | [2] | (33,800,000) | [1]
Balance at End of Period | 745,200,000 |  | 439,000,000 |  | 745,200,000 |  | 439,000,000 |
Hybrids [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period |  |  |  |  |  |  | 8,800,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  | (100,000) |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  |  |  |  | (8,700,000) | [1]
Balance at End of Period |  |  |  |  |  |  |  |
Municipals [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 35,600,000 |  |  |  |  |  |  |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in AOCI | 900,000 |  |  |  | 1,500,000 |  |  |
Purchases | 0 |  |  |  | 35,000,000 |  |  |
Sales | 0 |  |  |  | 0 |  |  |
Settlements | 0 |  |  |  | 0 |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  |  | [2] |  |
Balance at End of Period | 36,500,000 |  |  |  | 36,500,000 |  |  |
Equity securities available-for-sale [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 0 |  | 10,000,000 |  | 0 |  | 0 |
Total Gains (Losses) Included in Earnings | 1,200,000 |  | 0 |  | 0 |  | 0 |
Total Gains (Losses) Included in AOCI | 500,000 |  | 1,600,000 |  | 500,000 |  | 1,600,000 |
Purchases | 5,500,000 |  | 100,000 |  | 5,500,000 |  | 10,100,000 |
Sales | 0 |  | 0 |  | 0 |  | 0 |
Settlements | 0 |  | 0 |  | 0 |  | 0 |
Net transfer In (Out) of Level 3 (a) | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2]
Balance at End of Period | 6,000,000 |  | 11,700,000 |  | 6,000,000 |  | 11,700,000 |
Held for trading [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 10,800,000 |  |  |  | 10,700,000 |  |  |
Total Gains (Losses) Included in Earnings | 0 |  |  |  | 1,300,000 |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases | 1,500,000 |  |  |  | 1,500,000 |  |  |
Sales | 0 |  |  |  | 0 |  |  |
Settlements | (13,500,000) |  |  |  | (13,500,000) |  |  |
Net transfer In (Out) of Level 3 (a) | 0 | [2] |  |  | 0 | [2] |  |
Balance at End of Period | 0 |  |  |  | 0 |  |  |
Nomura Fund Linked Note [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in AOCI | 0 |  |  |  | 0 |  |  |
Purchases | 11,300,000 |  |  |  | 11,300,000 |  |  |
Sales | 0 |  |  |  | 0 |  |  |
Settlements | 0 |  |  |  | 0 |  |  |
Net transfer In (Out) of Level 3 (a) | 0 | [2] |  |  | 0 | [2] |  |
Balance at End of Period | 11,600,000 |  |  |  | 11,600,000 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Total Gains (Losses) Included in Earnings | 300,000 |  |  |  | 300,000 |  |  |
Contingent purchase price reduction receivable [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | 41,500,000 |  | 41,000,000 |  | 41,000,000 |  | 41,000,000 |
Total Gains (Losses) Included in Earnings |  |  |  |  | 500,000 |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  |  |
Purchases |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Settlements |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [2] |  | [1] |  | [2] |  | [1]
Balance at End of Period | $ 41,500,000 |  | $ 41,000,000 |  | $ 41,500,000 |  | $ 41,000,000 |
[1] | (a)The net transfers in and out of Level 3 during the nine months ended June 30, 2013 were exclusively to or from Level 2.
[2] | This includes a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from level 3 to level 2.

X
- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant