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Investments - Available-for-Sale Securities (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  | Jun. 30, 2014 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 930,600,000 |  | $ 502,700,000 |  | $ 930,600,000 |  | $ 502,700,000 |  | $ 755,600,000 | $ 523,500,000 | $ 419,000,000 | $ 206,000,000
Total Gains (Losses) Included in Earnings | 1,500,000 |  |  |  | 2,100,000 |  | (300,000) |  |  |  |  |
Total investments, Carrying Value | 18,751,100,000 |  |  |  | 18,751,100,000 |  |  |  |  | 16,465,900,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 15,914,300,000 |  |  |  | 15,914,300,000 |  |  |  |  |  |  |
Total investments, Cost or Amortized Cost | 17,744,600,000 |  |  |  | 17,744,600,000 |  |  |  |  | 16,190,100,000 |  |
Investments, Unrealized Losses | (100,300,000) |  |  |  | (100,300,000) |  |  |  |  | (311,500,000) |  |
Investments, Unrealized Gains | 1,106,800,000 |  |  |  | 1,106,800,000 |  |  |  |  | 587,300,000 |  |
Total investment, Estimated Fair Value | 18,751,100,000 |  |  |  | 18,751,100,000 |  |  |  |  | 16,465,900,000 |  |
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 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 1,000,000 |  |  |  | 1,000,000 |  | 9,600,000 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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] |  |  |  |
Asset-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 5,900,000 |  | 5,100,000 |  | 5,900,000 |  | 5,100,000 |  | 10,700,000 | 5,000,000 | 5,300,000 | 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 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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] |  |  |  |
Commercial mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 83,900,000 |  | 5,900,000 |  | 83,900,000 |  | 5,900,000 |  |  | 5,700,000 | 6,200,000 | 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 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  |  |  | 0 |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | [2] |  | [1] | (6,000,000) | [2] |  | [1] |  |  |  |
Corporates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 745,200,000 |  | 439,000,000 |  | 745,200,000 |  | 439,000,000 |  | 657,000,000 | 461,100,000 | 356,500,000 | 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 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 1,000,000 |  |  |  | 1,000,000 |  | 9,600,000 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, 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] |  |  |  |
Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  |  |  |  |  |  |  |  |  |  | 8,800,000
Total Gains (Losses) Included in Earnings |  |  |  |  |  |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  |  |  |  |  |  | (100,000) |  |  |  |  |
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) |  |  |  |  |  |  | (8,700,000) | [1] |  |  |  |
Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 36,500,000 |  |  |  | 36,500,000 |  |  |  | 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 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  |  |  | 0 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  |  |  | 0 |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 |  |  |  |  | [2] |  |  |  |  |  |
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 | 900,000 |  |  |  | 900,000 |  |  |  |  |  |  |
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities |  |  |  |  |  |  |  |  |  | (1,900,000) |  |
Other Marketable Securities, Current | 14,795,600,000 |  |  |  | 14,795,600,000 |  |  |  |  | 19,400,000 |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 6,000,000 |  | 11,700,000 |  | 6,000,000 |  | 11,700,000 |  | 0 | 0 | 10,000,000 | 0
Total Gains (Losses) Included in Earnings | 1,200,000 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 29,600,000 |  |  |  | 29,600,000 |  |  |  |  | 7,300,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (35,600,000) |  |  |  | (35,600,000) |  |  |  |  | (49,500,000) |  |
Available-for-sale Securities, Equity Securities | 760,700,000 |  |  |  | 760,700,000 |  |  |  |  | 352,500,000 |  |
Total investments, Carrying Value | 760,700,000 |  |  |  | 760,700,000 |  |  |  |  | 352,500,000 |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 766,700,000 |  |  |  | 766,700,000 |  |  |  |  | 394,700,000 |  |
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 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] |  |  |  |
Equity Securities [Member] | Available-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 23,500,000 |  |  |  | 23,500,000 |  |  |  |  | 6,700,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (4,900,000) |  |  |  | (4,900,000) |  |  |  |  | (10,300,000) |  |
Available-for-sale Securities, Equity Securities | 663,400,000 |  |  |  | 663,400,000 |  |  |  |  | 271,000,000 |  |
Total investments, Carrying Value | 663,400,000 |  |  |  | 663,400,000 |  |  |  |  | 271,000,000 |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 644,800,000 |  |  |  | 644,800,000 |  |  |  |  | 274,600,000 |  |
Equity Securities [Member] | Held for trading [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 6,100,000 |  |  |  | 6,100,000 |  |  |  |  | 600,000 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (30,700,000) |  |  |  | (30,700,000) |  |  |  |  | (39,200,000) |  |
Available-for-sale Securities, Equity Securities | 97,300,000 |  |  |  | 97,300,000 |  |  |  |  | 81,500,000 |  |
Total investments, Carrying Value | 97,300,000 |  |  |  | 97,300,000 |  |  |  |  | 81,500,000 |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 121,900,000 |  |  |  | 121,900,000 |  |  |  |  | 120,100,000 |  |
Fixed-maturity securities, available-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 916,500,000 |  |  |  | 916,500,000 |  |  |  |  | 491,500,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (63,700,000) |  |  |  | (63,700,000) |  |  |  |  | (253,600,000) |  |
Available-for-sale Securities, Debt Securities | 16,767,100,000 |  |  |  | 16,767,100,000 |  |  |  |  | 15,300,000,000 |  |
Total investments, Carrying Value | 16,767,100,000 |  |  |  | 16,767,100,000 |  |  |  |  | 15,300,000,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 15,914,300,000 |  |  |  | 15,914,300,000 |  |  |  |  | 15,062,100,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Asset-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 16,100,000 |  |  |  | 16,100,000 |  |  |  |  | 22,600,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (9,500,000) |  |  |  | (9,500,000) |  |  |  |  | (5,200,000) |  |
Available-for-sale Securities, Debt Securities | 1,737,700,000 |  |  |  | 1,737,700,000 |  |  |  |  | 1,523,100,000 |  |
Total investments, Carrying Value | 1,737,700,000 |  |  |  | 1,737,700,000 |  |  |  |  | 1,523,100,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,731,100,000 |  |  |  | 1,731,100,000 |  |  |  |  | 1,505,700,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Commercial mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 26,300,000 |  |  |  | 26,300,000 |  |  |  |  | 24,700,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,100,000) |  |  |  | (1,100,000) |  |  |  |  | (1,600,000) |  |
Available-for-sale Securities, Debt Securities | 610,200,000 |  |  |  | 610,200,000 |  |  |  |  | 454,400,000 |  |
Total investments, Carrying Value | 610,200,000 |  |  |  | 610,200,000 |  |  |  |  | 454,400,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 585,000,000 |  |  |  | 585,000,000 |  |  |  |  | 431,300,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Corporates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 568,500,000 |  |  |  | 568,500,000 |  |  |  |  | 288,700,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (36,600,000) |  |  |  | (36,600,000) |  |  |  |  | (185,100,000) |  |
Available-for-sale Securities, Debt Securities | 10,297,800,000 |  |  |  | 10,297,800,000 |  |  |  |  | 9,418,300,000 |  |
Total investments, Carrying Value | 10,297,800,000 |  |  |  | 10,297,800,000 |  |  |  |  | 9,418,300,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 9,765,900,000 |  |  |  | 9,765,900,000 |  |  |  |  | 9,314,700,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Hybrids [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 39,800,000 |  |  |  | 39,800,000 |  |  |  |  | 19,500,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (200,000) |  |  |  | (200,000) |  |  |  |  | (3,300,000) |  |
Available-for-sale Securities, Debt Securities | 481,600,000 |  |  |  | 481,600,000 |  |  |  |  | 428,800,000 |  |
Total investments, Carrying Value | 481,600,000 |  |  |  | 481,600,000 |  |  |  |  | 428,800,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 442,000,000 |  |  |  | 442,000,000 |  |  |  |  | 412,600,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 111,900,000 |  |  |  | 111,900,000 |  |  |  |  | 49,000,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (7,200,000) |  |  |  | (7,200,000) |  |  |  |  | (40,800,000) |  |
Available-for-sale Securities, Debt Securities | 1,255,700,000 |  |  |  | 1,255,700,000 |  |  |  |  | 1,007,000,000 |  |
Total investments, Carrying Value | 1,255,700,000 |  |  |  | 1,255,700,000 |  |  |  |  | 1,007,000,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,151,000,000 |  |  |  | 1,151,000,000 |  |  |  |  | 998,800,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3,400,000 |  |  |  | 3,400,000 |  |  |  |  | 2,400,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  |  |  |  |  |  | (300,000) |  |
Available-for-sale Securities, Debt Securities | 99,500,000 |  |  |  | 99,500,000 |  |  |  |  | 98,600,000 |  |
Total investments, Carrying Value | 99,500,000 |  |  |  | 99,500,000 |  |  |  |  | 98,600,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 96,100,000 |  |  |  | 96,100,000 |  |  |  |  | 96,500,000 |  |
Fixed-maturity securities, available-for-sale [Member] | Non-agency residential mortgage-backed securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 143,300,000 |  |  |  | 143,300,000 |  |  |  |  | 77,400,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (7,800,000) |  |  |  | (7,800,000) |  |  |  |  | (13,400,000) |  |
Available-for-sale Securities, Debt Securities | 1,874,100,000 |  |  |  | 1,874,100,000 |  |  |  |  | 1,368,000,000 |  |
Total investments, Carrying Value | 1,874,100,000 |  |  |  | 1,874,100,000 |  |  |  |  | 1,368,000,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,738,600,000 |  |  |  | 1,738,600,000 |  |  |  |  | 1,304,000,000 |  |
Fixed-maturity securities, available-for-sale [Member] | U.S. Government securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 7,200,000 |  |  |  | 7,200,000 |  |  |  |  | 7,200,000 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,300,000) |  |  |  | (1,300,000) |  |  |  |  | (3,900,000) |  |
Available-for-sale Securities, Debt Securities | 410,500,000 |  |  |  | 410,500,000 |  |  |  |  | 1,001,800,000 |  |
Total investments, Carrying Value | 410,500,000 |  |  |  | 410,500,000 |  |  |  |  | 1,001,800,000 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 404,600,000 |  |  |  | 404,600,000 |  |  |  |  | 998,500,000 |  |
Derivative Financial Instruments, Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost | 165,100,000 |  |  |  | 165,100,000 |  |  |  |  | 141,700,000 |  |
Trading Securities | 324,700,000 |  |  |  | 324,700,000 |  |  |  |  | 221,800,000 |  |
Asset-Backed Loans, Gross Unrealized Gain | 160,600,000 |  |  |  | 160,600,000 |  |  |  |  | 88,500,000 |  |
Other Short Term Investments Gross Unrealized Losses | (1,000,000) |  |  |  | (1,000,000) |  |  |  |  | (8,400,000) |  |
Asset based loan receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost | 724,300,000 |  |  |  | 724,300,000 |  |  |  |  | 560,400,000 |  |
Trading Securities | 724,300,000 |  |  |  | 724,300,000 |  |  |  |  | 560,400,000 |  |
Asset-Backed Loans, Gross Unrealized Gain |  |  |  |  |  |  |  |  |  |  |  |
Other Short Term Investments Gross Unrealized Losses |  |  |  |  |  |  |  |  |  |  |  |
Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost | 174,200,000 |  |  |  | 174,200,000 |  |  |  |  | 31,200,000 |  |
Trading Securities | 174,300,000 |  |  |  | 174,300,000 |  |  |  |  | 31,200,000 |  |
Asset-Backed Loans, Gross Unrealized Gain | 100,000 |  |  |  | 100,000 |  |  |  |  |  |  |
Other Short Term Investments Gross Unrealized Losses |  |  |  |  |  |  |  |  |  |  |  |
[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.

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