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Investments - Consolidated Investments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013
Schedule of Investments [Line Items] |  |
Document Period End Date | Sep. 30, 2014 |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 16,468.7 |
Available For Sale Securities Carrying Value | 19,252.5 | 16,465.9
Unrealized Amortized Cost On Securities | 18,409.8 | 16,190.1
Investments, Unrealized Gains | 1,001.1 | 587.3
Investments, Unrealized Losses | (158.4) | (311.5)
Available For Sale Securities Fair Value | 19,252.5 | 16,465.9
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Available For Sale Securities Carrying Value | 768.1 | 352.5
Available-for-sale Equity Securities, Amortized Cost Basis | 786.9 | 394.7
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 31.2 | 7.3
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (50.0) | (49.5)
Available-for-sale Securities, Equity Securities | 768.1 | 352.5
Equity Securities | Available-for-sale |  |
Schedule of Investments [Line Items] |  |
Available For Sale Securities Carrying Value | 663.6 | 271.0
Available-for-sale Equity Securities, Amortized Cost Basis | 645.7 | 274.6
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 23.0 | 6.7
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (5.1) | (10.3)
Available-for-sale Securities, Equity Securities | 663.6 | 271.0
Equity Securities | Held for trading |  |
Schedule of Investments [Line Items] |  |
Available For Sale Securities Carrying Value | 104.5 | 81.5
Available-for-sale Equity Securities, Amortized Cost Basis | 141.2 | 120.1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 8.2 | 0.6
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (44.9) | (39.2)
Available-for-sale Securities, Equity Securities | 104.5 | 81.5
Fixed-maturity securities, available-for-sale |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 16,468.7 | 15,062.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 846.5 | 491.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (103.7) | (253.6)
Available-for-sale Securities, Debt Securities | 17,211.5 | 15,300.0
Available For Sale Securities Carrying Value | 17,211.5 | 15,300.0
Fixed-maturity securities, available-for-sale | Asset-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,800.8 | 1,505.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 10.9 | 22.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (18.8) | (5.2)
Available-for-sale Securities, Debt Securities | 1,792.9 | 1,523.1
Available For Sale Securities Carrying Value | 1,792.9 | 1,523.1
Fixed-maturity securities, available-for-sale | Commercial mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 617.6 | 431.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 21.3 | 24.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (2.0) | (1.6)
Available-for-sale Securities, Debt Securities | 636.9 | 454.4
Available For Sale Securities Carrying Value | 636.9 | 454.4
Fixed-maturity securities, available-for-sale | Corporates |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 9,345.5 | 9,314.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 499.2 | 288.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (48.9) | (185.1)
Available-for-sale Securities, Debt Securities | 9,795.8 | 9,418.3
Available For Sale Securities Carrying Value | 9,795.8 | 9,418.3
Fixed-maturity securities, available-for-sale | Hybrids |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,279.1 | 412.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 52.2 | 19.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (15.2) | (3.3)
Available-for-sale Securities, Debt Securities | 1,316.1 | 428.8
Available For Sale Securities Carrying Value | 1,316.1 | 428.8
Fixed-maturity securities, available-for-sale | Municipals |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,149.9 | 998.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 116.2 | 49.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (6.3) | (40.8)
Available-for-sale Securities, Debt Securities | 1,259.8 | 1,007.0
Available For Sale Securities Carrying Value | 1,259.8 | 1,007.0
Fixed-maturity securities, available-for-sale | Agency Residential Mortgage Backed Securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 104.3 | 96.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3.1 | 2.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.1) | (0.3)
Available-for-sale Securities, Debt Securities | 107.3 | 98.6
Available For Sale Securities Carrying Value | 107.3 | 98.6
Fixed-maturity securities, available-for-sale | Non-agency residential mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,880.5 | 1,304.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 137.2 | 77.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (11.0) | (13.4)
Available-for-sale Securities, Debt Securities | 2,006.7 | 1,368.0
Available For Sale Securities Carrying Value | 2,006.7 | 1,368.0
Fixed-maturity securities, available-for-sale | U.S. Government |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 291.0 | 998.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 6.4 | 7.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1.4) | (3.9)
Available-for-sale Securities, Debt Securities | 296.0 | 1,001.8
Available For Sale Securities Carrying Value | 296.0 | 1,001.8
Asset based loan receivables [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities, Cost | 811.6 | 560.4
Other Investments Gross Unrealized Gain |  |
Other Short Term Investments Gross Unrealized Losses |  |
Trading Securities | 811.6 | 560.4
Derivative Financial Instruments, Assets [Member] |  |
Schedule of Investments [Line Items] |  |
Trading Securities, Cost | 177.7 | 141.7
Other Investments Gross Unrealized Gain | 123.3 | 88.5
Other Short Term Investments Gross Unrealized Losses | (4.7) | (8.4)
Trading Securities | 296.3 | 221.8
Other invested assets |  |
Schedule of Investments [Line Items] |  |
Trading Securities, Cost |  | 31.2
Other Investments Gross Unrealized Gain |  |
Other Short Term Investments Gross Unrealized Losses |  |
Trading Securities | 165.0 | 31.2
Other invested assets | Other invested assets | Policy loans and other invested assets |  |
Schedule of Investments [Line Items] |  |
Trading Securities, Cost | 164.9 |
Other Investments Gross Unrealized Gain | $ 0.1 |

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