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Investments - Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Schedule of Investments [Line Items] |  |  |  |  |  |
Document Period End Date | Dec. 31, 2013 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 709.5 |  | $ 313.5 |  | $ 523.5 | $ 206.0
Total Gains (Losses) Included in Earnings | 0.6 |  | (0.2) |  |  |
Asset Backed Securities Fair Value Disclosure | 794.0 |  |  |  | 560.4 |
Total investments, Carrying Value | 17,668.3 |  |  |  | 16,465.9 |
Derivative investments, Cost or Amortized Cost | 148.3 |  |  |  | 141.7 |
Derivative investments, Gross Unrealized Gains | 147.0 |  |  |  | 88.5 |
Derivative investments, Gross Unrealized Losses | 0.8 |  |  |  | 8.4 |
Derivative investments, Estimated Fair Value | 294.5 |  |  |  | 221.8 |
Derivative investments, Carrying Value | 294.5 |  |  |  | 221.8 |
Asset-Backed Loans, Cost or Amortized Cost | 794.0 |  |  |  | 560.4 |
Asset-Backed Loans, Gross Unrealized Gain |  |  |  |  |  |
Other Short Term Investments Gross Unrealized Losses |  |  |  |  |  |
Asset-Backed Loans, at Carrying Value | 794.0 |  |  |  | 560.4 |
Total investments, Cost or Amortized Cost | 17,341.2 |  |  |  | 16,190.1 |
Investments, Unrealized Losses | (322.3) |  |  |  | (311.5) |
Investments, Unrealized Gains | 649.4 |  |  |  | 587.3 |
Total investment, Gross Unrealized Losses | (280.1) |  |  |  | (263.9) |
Total investment, Estimated Fair Value | 17,668.3 |  |  |  | 16,465.9 |
Total Gains (Losses) Included in AOCI | (6.7) |  | (2.1) |  |  |
Purchases | 192.6 |  | 134.2 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | 9.6 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0.5 |  | 0.7 |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] | (14.1) | [2] |  |
Asset-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 9.8 |  | 5.3 |  | 5.0 | 15.9
Total Gains (Losses) Included in Earnings | 0 |  |  |  |  |
Total investment, Gross Unrealized Losses | (8.0) |  |  |  | (5.2) |
Total Gains (Losses) Included in AOCI | (0.2) |  | (0.1) |  |  |
Purchases |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] | (10.5) | [2] |  |
Commercial mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 6.0 |  | 6.1 |  | 5.7 | 5.0
Total Gains (Losses) Included in Earnings |  |  |  |  |  |
Total investment, Gross Unrealized Losses | (3.2) |  |  |  | (1.6) |
Total Gains (Losses) Included in AOCI | 0.3 |  | 0.1 |  |  |
Purchases |  |  | 1.0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  | [2] |  |
Corporates [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 607.1 |  | 256.1 |  | 461.1 | 135.3
Total Gains (Losses) Included in Earnings | 0 |  | (0.2) |  |  |
Total investment, Gross Unrealized Losses | (189.3) |  |  |  | (185.1) |
Total Gains (Losses) Included in AOCI | (6.1) |  | (2.0) |  |  |
Purchases | 152.6 |  | 133.2 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  | 9.6 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0.5 |  | 0.7 |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] | 0.1 | [2] |  |
Hybrids [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 5.0 |  |  | 8.8
Total Gains (Losses) Included in Earnings |  |  |  |  |  |
Total investment, Gross Unrealized Losses | (3.2) |  |  |  | (3.3) |
Total Gains (Losses) Included in AOCI |  |  | (0.1) |  |  |
Purchases |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  | (3.7) | [2] |  |
Municipals [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 34.3 |  |  |  |  |
Total Gains (Losses) Included in Earnings | 0 |  |  |  |  |
Total investment, Gross Unrealized Losses | (45.0) |  |  |  | (40.8) |
Total Gains (Losses) Included in AOCI | (0.7) |  |  |  |  |
Purchases | 35.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [1] |  |  |  |
Agency residential mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Total investment, Gross Unrealized Losses | (0.1) |  |  |  | (0.3) |
Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities | 0.9 |  |  |  |  |
Total investment, Gross Unrealized Losses | (11.3) |  |  |  | (13.4) |
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities | 1.9 |  |  |  | (1.9) |
Other Marketable Securities, Current | 13,727.8 |  |  |  | 19.4 |
U.S. Government securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Total investment, Gross Unrealized Losses | (6.2) |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 418.3 |  |  |  | 394.7 |
Equity Securities, Estimated Fair Value | 375.9 |  |  |  | 352.5 |
Total investments, Carrying Value | 375.9 |  |  |  | 352.5 |
Total investment, Gross Unrealized Gains | 12.8 |  |  |  | 7.3 |
Total investment, Gross Unrealized Losses | 55.2 |  |  |  | 49.5 |
Equity Securities [Member] | Available-for-sale [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 293.9 |  |  |  | 274.6 |
Equity Securities, Estimated Fair Value | 286.9 |  |  |  | 271.0 |
Total investments, Carrying Value | 286.9 |  |  |  | 271.0 |
Total investment, Gross Unrealized Gains | 6.8 |  |  |  | 6.7 |
Total investment, Gross Unrealized Losses | 13.8 |  |  |  | 10.3 |
Equity Securities [Member] | Held for trading [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 124.4 |  |  |  | 120.1 |
Equity Securities, Estimated Fair Value | 89.0 |  |  |  | 81.5 |
Total investments, Carrying Value | 89.0 |  |  |  | 81.5 |
Total investment, Gross Unrealized Gains | 6.0 |  |  |  | 0.6 |
Total investment, Gross Unrealized Losses | 41.4 |  |  |  | 39.2 |
Fixed-maturity securities, available-for-sale [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 15,863.3 |  |  |  | 15,062.1 |
Equity Securities, Estimated Fair Value | 16,086.6 |  |  |  | 15,300.0 |
Total investments, Carrying Value | 16,086.6 |  |  |  | 15,300.0 |
Total investment, Gross Unrealized Gains | 489.6 |  |  |  | 491.5 |
Total investment, Gross Unrealized Losses | 266.3 |  |  |  | 253.6 |
Fixed-maturity securities, available-for-sale [Member] | Asset-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 1,590.7 |  |  |  | 1,505.7 |
Equity Securities, Estimated Fair Value | 1,601.8 |  |  |  | 1,523.1 |
Total investments, Carrying Value | 1,601.8 |  |  |  | 1,523.1 |
Total investment, Gross Unrealized Gains | 19.1 |  |  |  | 22.6 |
Total investment, Gross Unrealized Losses | 8.0 |  |  |  | 5.2 |
Fixed-maturity securities, available-for-sale [Member] | Commercial mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 422.6 |  |  |  | 431.3 |
Equity Securities, Estimated Fair Value | 444.6 |  |  |  | 454.4 |
Total investments, Carrying Value | 444.6 |  |  |  | 454.4 |
Total investment, Gross Unrealized Gains | 25.2 |  |  |  | 24.7 |
Total investment, Gross Unrealized Losses | 3.2 |  |  |  | 1.6 |
Fixed-maturity securities, available-for-sale [Member] | Corporates [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 9,963.8 |  |  |  | 9,314.7 |
Equity Securities, Estimated Fair Value | 10,046.6 |  |  |  | 9,418.3 |
Total investments, Carrying Value | 10,046.6 |  |  |  | 9,418.3 |
Total investment, Gross Unrealized Gains | 272.1 |  |  |  | 288.7 |
Total investment, Gross Unrealized Losses | 189.3 |  |  |  | 185.1 |
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 400.5 |  |  |  | 412.6 |
Equity Securities, Estimated Fair Value | 418.1 |  |  |  | 428.8 |
Total investments, Carrying Value | 418.1 |  |  |  | 428.8 |
Total investment, Gross Unrealized Gains | 20.8 |  |  |  | 19.5 |
Total investment, Gross Unrealized Losses | 3.2 |  |  |  | 3.3 |
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 1,121.2 |  |  |  | 998.8 |
Equity Securities, Estimated Fair Value | 1,121.4 |  |  |  | 1,007.0 |
Total investments, Carrying Value | 1,121.4 |  |  |  | 1,007.0 |
Total investment, Gross Unrealized Gains | 45.2 |  |  |  | 49.0 |
Total investment, Gross Unrealized Losses | 45.0 |  |  |  | 40.8 |
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 88.9 |  |  |  | 96.5 |
Equity Securities, Estimated Fair Value | 91.0 |  |  |  | 98.6 |
Total investments, Carrying Value | 91.0 |  |  |  | 98.6 |
Total investment, Gross Unrealized Gains | 2.2 |  |  |  | 2.4 |
Total investment, Gross Unrealized Losses | 0.1 |  |  |  | 0.3 |
Fixed-maturity securities, available-for-sale [Member] | Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 1,564.1 |  |  |  | 1,304.0 |
Equity Securities, Estimated Fair Value | 1,652.0 |  |  |  | 1,368.0 |
Total investments, Carrying Value | 1,652.0 |  |  |  | 1,368.0 |
Total investment, Gross Unrealized Gains | 99.2 |  |  |  | 77.4 |
Total investment, Gross Unrealized Losses | 11.3 |  |  |  | 13.4 |
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 711.5 |  |  |  | 998.5 |
Equity Securities, Estimated Fair Value | 711.1 |  |  |  | 1,001.8 |
Total investments, Carrying Value | 711.1 |  |  |  | 1,001.8 |
Total investment, Gross Unrealized Gains | 5.8 |  |  |  | 7.2 |
Total investment, Gross Unrealized Losses | 6.2 |  |  |  | 3.9 |
Other invested assets [Member] | Policy loans and other invested assets [Member] |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity Securities, Cost or Amortized Cost | 117.3 |  |  |  | 31.2 |
Equity Securities, Estimated Fair Value | 117.3 |  |  |  | 31.2 |
Total investments, Carrying Value | 117.3 |  |  |  | 31.2 |
Total investment, Gross Unrealized Gains | 0 |  |  |  |  |
Total investment, Gross Unrealized Losses | $ 0 |  |  |  |  |
[1] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjkzMWUzNTc5OTc5ZDQ0NDA5NDZlZDlmNTcyN2JmYzMyfFRleHRTZWxlY3Rpb246REVBMUNFNjUwNzU2Q0U3MUVERDcwNjlDQTlGMzA0OTIM}
[2] | (a)The net transfers in and out of Level 3 during the three months ended December 30, 2012 was exclusively to or from Level 2.

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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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) 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)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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