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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  | $ 0 |  |  |  | $ 0 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 1,222,900,000 |  | $ 755,600,000 |  | 1,066,000,000 |  | $ 523,500,000 |
Total Gains (Losses) Included in Earnings |  | (13,800,000) |  | 1,500,000 |  | (4,900,000) |  | 2,100,000 |
Total Gains (Losses) Included in AOCI |  | (24,100,000) |  | 15,900,000 |  | 4,300,000 |  | 20,500,000 |
Purchases |  |  |  | 191,000,000 |  | 186,800,000 |  | 425,300,000 |
Sales |  | (1,600,000) |  | (1,000,000) |  | (1,600,000) |  | (1,000,000) |
Settlements |  | (53,400,000) |  | (13,500,000) |  | (87,100,000) |  | (15,900,000) |
Net transfer In (Out) of Level 3 (a) |  | 18,100,000 | [1] | (18,900,000) | [2] | (15,400,000) | [3] | (23,900,000) | [4]
Balance at End of Period |  | 1,148,100,000 |  | 930,600,000 |  | 1,148,100,000 |  | 930,600,000 |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 2,801,900,000 |  | 2,234,500,000 |  | 2,059,400,000 |  | 1,875,200,000 |
Total Gains (Losses) Included in Earnings |  | (75,400,000) |  | 112,900,000 |  | 240,300,000 |  | 340,900,000 |
Total Gains (Losses) Included in AOCI |  | 0 |  |  |  | 0 |  |  |
Purchases |  | 77,600,000 |  | 0 |  | 514,600,000 |  | 150,600,000 |
Sales |  | 0 |  | 0 |  | 0 |  | 0 |
Settlements |  | (35,800,000) |  | (328,000,000) |  | (46,000,000) |  | (347,300,000) |
Net transfer In (Out) of Level 3 |  | 0 | [1] | 0 | [2] | 0 | [3] | 0 | [4]
Balance at End of Period |  | 2,768,300,000 |  | 2,019,400,000 |  | 2,768,300,000 |  | 2,019,400,000 |
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 |  | 2,217,400,000 |  | 1,718,700,000 |  | 1,908,100,000 |  | 1,544,400,000 |
Total Gains (Losses) Included in Earnings |  | (43,700,000) |  | 145,800,000 |  | 265,600,000 |  | 320,100,000 |
Total Gains (Losses) Included in AOCI |  |  |  | 0 |  |  |  | 0 |
Purchases |  |  |  | 0 |  |  |  | 0 |
Sales |  |  |  | 0 |  |  |  | 0 |
Settlements |  |  |  | 0 |  |  |  | 0 |
Net transfer In (Out) of Level 3 |  |  |  | 0 | [2] |  |  | 0 | [4]
Balance at End of Period |  | 2,173,700,000 |  | 1,864,500,000 |  | 2,173,700,000 |  | 1,864,500,000 |
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 |  | 584,500,000 |  | 151,000,000 |  | 151,300,000 |  |  |
Total Gains (Losses) Included in Earnings |  | (31,700,000) |  | 5,100,000 |  | (25,300,000) |  | 8,100,000 |
Purchases |  | 77,600,000 |  |  |  | 514,600,000 |  | 150,600,000 |
Settlements |  | (35,800,000) |  | (1,200,000) |  | (46,000,000) |  | (3,800,000) |
Balance at End of Period |  | 594,600,000 |  | 154,900,000 |  | 594,600,000 |  | 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 |  |  |  | 330,800,000 |
Total Gains (Losses) Included in Earnings |  |  |  | (38,000,000) |  |  |  | 12,700,000 |
Total Gains (Losses) Included in AOCI |  |  |  | 0 |  |  |  | 0 |
Purchases |  |  |  | 0 |  |  |  | 0 |
Sales |  |  |  | 0 |  |  |  | 0 |
Settlements |  |  |  | (326,800,000) |  |  |  | (343,500,000) |
Net transfer In (Out) of Level 3 |  |  |  | 0 | [2] |  |  | 0 | [4]
Balance at End of Period |  |  |  | 0 |  |  |  | 0 |
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 |  |  |  | 0 |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 34,300,000 |  | 10,700,000 |  | 37,000,000 |  | 5,000,000 |
Total Gains (Losses) Included in Earnings |  | 0 |  |  |  | 100,000 |  |  |
Total Gains (Losses) Included in AOCI |  | (100,000) |  |  |  | (100,000) |  | (300,000) |
Purchases |  | 0 |  |  |  | 6,700,000 |  | 5,000,000 |
Settlements |  | (100,000) |  |  |  | (200,000) |  |  |
Net transfer In (Out) of Level 3 (a) |  | (1,000,000) | [3] | (4,800,000) | [2] | (10,400,000) | [3] | (3,800,000) | [4]
Balance at End of Period |  | 33,100,000 |  | 5,900,000 |  | 33,100,000 |  | 5,900,000 |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 142,500,000 |  |  |  | 83,100,000 |  | 5,700,000 |
Total Gains (Losses) Included in AOCI |  | (1,900,000) |  | 100,000 |  | 400,000 |  | 400,000 |
Purchases |  |  |  | 83,800,000 |  | 57,700,000 |  | 83,800,000 |
Settlements |  | (500,000) |  |  |  | (1,100,000) |  |  |
Net transfer In (Out) of Level 3 (a) | [4] |  |  |  |  |  |  | (6,000,000) |
Balance at End of Period |  | 140,100,000 |  | 83,900,000 |  | 140,100,000 |  | 83,900,000 |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 941,100,000 |  | 657,000,000 |  | 850,000,000 |  | 461,100,000 |
Total Gains (Losses) Included in Earnings |  | 0 |  |  |  | 2,300,000 |  |  |
Total Gains (Losses) Included in AOCI |  | (20,000,000) |  | 14,400,000 |  | 3,300,000 |  | 18,400,000 |
Purchases |  | 0 |  | 88,900,000 |  | 122,400,000 |  | 283,200,000 |
Sales |  | (1,600,000) |  | (1,000,000) |  | (1,600,000) |  | (1,000,000) |
Settlements |  | (2,600,000) |  |  |  | (35,400,000) |  | (2,400,000) |
Net transfer In (Out) of Level 3 (a) |  |  |  | (14,100,000) | [2] | (24,100,000) | [3] | (14,100,000) | [4]
Balance at End of Period |  | 916,900,000 |  | 745,200,000 |  | 916,900,000 |  | 745,200,000 |
Municipals [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | 39,800,000 |  | 35,600,000 |  | 37,200,000 |  |  |
Total Gains (Losses) Included in Earnings |  | 0 |  |  |  | 0 |  |  |
Total Gains (Losses) Included in AOCI |  | (2,100,000) |  | 900,000 |  | 700,000 |  | 1,500,000 |
Purchases |  | 0 |  |  |  | 0 |  | 35,000,000 |
Sales |  | 0 |  |  |  | 0 |  |  |
Settlements |  | (200,000) |  |  |  | (400,000) |  |  |
Net transfer In (Out) of Level 3 (a) |  | 0 | [1] |  |  | 0 | [3] |  |
Balance at End of Period |  | 37,500,000 |  | 36,500,000 |  | 37,500,000 |  | 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 |  | 6,000,000 |  | 10,800,000 |  | 6,000,000 |  | 10,700,000 |
Total Gains (Losses) Included in Earnings |  |  |  | 1,200,000 |  |  |  | 1,300,000 |
Total Gains (Losses) Included in AOCI |  | 0 |  | 0 |  | 0 |  | 0 |
Purchases |  | 0 |  | 1,500,000 |  | 0 |  | 1,500,000 |
Sales |  | 0 |  | 0 |  | 0 |  | 0 |
Settlements |  | 0 |  | (13,500,000) |  | 0 |  | (13,500,000) |
Net transfer In (Out) of Level 3 (a) |  | 0 | [1] | 0 | [2] | 0 | [3] | 0 | [4]
Balance at End of Period |  | 6,000,000 |  | 0 |  | 6,000,000 |  | 0 |
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 |  |  |  | 0 |
Total Gains (Losses) Included in AOCI |  |  |  | 500,000 |  |  |  | 500,000 |
Purchases |  |  |  | 5,500,000 |  |  |  | 5,500,000 |
Sales |  |  |  | 0 |  |  |  | 0 |
Settlements |  |  |  | 0 |  |  |  | 0 |
Net transfer In (Out) of Level 3 (a) | [1] |  |  | 0 |  |  |  | 0 |
Balance at End of Period |  |  |  | 6,000,000 |  |  |  | 6,000,000 |
Held for trading [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in Earnings |  | 0 |  | 0 |  | 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 |  | 12,200,000 |  | 0 |  | 11,200,000 |  | 0 |
Total Gains (Losses) Included in AOCI |  | 0 |  | 0 |  | 0 |  | 0 |
Purchases |  | 0 |  | 11,300,000 |  | 0 |  | 11,300,000 |
Sales |  | 0 |  | 0 |  | 0 |  | 0 |
Settlements |  | 0 |  | 0 |  | 0 |  | 0 |
Net transfer In (Out) of Level 3 (a) |  | 19,100,000 | [1] | 0 | [1] | 19,100,000 | [3] | 0 | [1]
Balance at End of Period |  | 14,500,000 |  | 11,600,000 |  | 14,500,000 |  | 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 |  | (16,800,000) |  | 300,000 |  | (15,800,000) |  | 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 |  | 47,000,000 |  | 41,500,000 |  | 41,500,000 |  | 41,000,000 |
Total Gains (Losses) Included in Earnings |  | 3,000,000 |  |  |  | 8,500,000 |  | 500,000 |
Settlements |  | $ (50,000,000) |  |  |  | $ (50,000,000) |  |  |
Balance at End of Period |  |  |  | $ 41,500,000 |  |  |  | $ 41,500,000 |
[1] | (a) During the three months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[2] | (a) The net transfers out of Level 3 for the three months ended June 30, 2014 were exclusively to Level 2.
[3] | (a) During the nine months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[4] | (a) The net transfers out of Level 3 for the nine months ended June 30, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from Level 3 to Level 2.

X
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- Definition Amount of sales 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlements 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + 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
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