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Investments - Available-for-Sale Securities (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015 | Sep. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  |  | Jun. 30, 2015 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 1,148.1 |  | $ 930.6 |  | $ 1,148.1 |  | $ 930.6 |  | $ 1,222.9 | $ 1,066.0 | $ 755.6 | $ 523.5
Total Gains (Losses) Included in Earnings |  | (13.8) |  | 1.5 |  | (4.9) |  | 2.1 |  |  |  |  |
Total investments, Carrying Value |  | 19,497.9 |  |  |  | 19,497.9 |  |  |  |  | 19,252.5 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 17,388.5 |  |  |  | 17,388.5 |  |  |  |  |  |  |
Total investments, Cost or Amortized Cost |  | 19,112.6 |  |  |  | 19,112.6 |  |  |  |  | 18,409.8 |  |
Investments, Unrealized Losses |  | (321.4) |  |  |  | (321.4) |  |  |  |  | (158.4) |  |
Investments, Unrealized Gains |  | 706.7 |  |  |  | 706.7 |  |  |  |  | 1,001.1 |  |
Total investment, Estimated Fair Value |  | 19,497.9 |  |  |  | 19,497.9 |  |  |  |  | 19,252.5 |  |
Total Gains (Losses) Included in AOCI |  | (24.1) |  | 15.9 |  | 4.3 |  | 20.5 |  |  |  |  |
Purchases |  |  |  | 191.0 |  | 186.8 |  | 425.3 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 1.6 |  | 1.0 |  | 1.6 |  | 1.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 53.4 |  | 13.5 |  | 87.1 |  | 15.9 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 18.1 | [1] | (18.9) | [2] | (15.4) | [3] | (23.9) | [4] |  |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 33.1 |  | 5.9 |  | 33.1 |  | 5.9 |  | 34.3 | 37.0 | 10.7 | 5.0
Total Gains (Losses) Included in Earnings |  | 0.0 |  |  |  | 0.1 |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  | (0.1) |  |  |  | (0.1) |  | (0.3) |  |  |  |  |
Purchases |  | 0.0 |  |  |  | 6.7 |  | 5.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0.1 |  |  |  | 0.2 |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | (1.0) | [3] | (4.8) | [2] | (10.4) | [3] | (3.8) | [4] |  |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 140.1 |  | 83.9 |  | 140.1 |  | 83.9 |  | 142.5 | 83.1 |  | 5.7
Total Gains (Losses) Included in AOCI |  | (1.9) |  | 0.1 |  | 0.4 |  | 0.4 |  |  |  |  |
Purchases |  |  |  | 83.8 |  | 57.7 |  | 83.8 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0.5 |  |  |  | 1.1 |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | [4] |  |  |  |  |  |  | (6.0) |  |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 916.9 |  | 745.2 |  | 916.9 |  | 745.2 |  | 941.1 | 850.0 | 657.0 | 461.1
Total Gains (Losses) Included in Earnings |  | 0.0 |  |  |  | 2.3 |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  | (20.0) |  | 14.4 |  | 3.3 |  | 18.4 |  |  |  |  |
Purchases |  | 0.0 |  | 88.9 |  | 122.4 |  | 283.2 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 1.6 |  | 1.0 |  | 1.6 |  | 1.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 2.6 |  |  |  | 35.4 |  | 2.4 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  |  |  | (14.1) | [2] | (24.1) | [3] | (14.1) | [4] |  |  |  |
Municipals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 37.5 |  | 36.5 |  | 37.5 |  | 36.5 |  | 39.8 | 37.2 | 35.6 |
Total Gains (Losses) Included in Earnings |  | 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |
Total Gains (Losses) Included in AOCI |  | (2.1) |  | 0.9 |  | 0.7 |  | 1.5 |  |  |  |  |
Purchases |  | 0.0 |  |  |  | 0.0 |  | 35.0 |  |  |  |  |
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 |  | 0.2 |  |  |  | 0.4 |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 0.0 | [1] |  |  | 0.0 | [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 |  |  |  | 0.9 |  |  |  |  |  |  |
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 |  | 15,964.0 |  |  |  | 15,964.0 |  |  |  |  | 15,009.3 |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 6.0 |  | 0.0 |  | 6.0 |  | 0.0 |  | $ 6.0 | 6.0 | $ 10.8 | $ 10.7
Total Gains (Losses) Included in Earnings |  |  |  | 1.2 |  |  |  | 1.3 |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 46.1 |  |  |  | 46.1 |  |  |  |  | 31.2 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax |  | (4.4) |  |  |  | (4.4) |  |  |  |  | (50.0) |  |
Available-for-sale Securities, Equity Securities |  | 621.5 |  |  |  | 621.5 |  |  |  |  | 768.1 |  |
Total investments, Carrying Value |  | 621.5 |  |  |  | 621.5 |  |  |  |  | 768.1 |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | 579.8 |  |  |  | 579.8 |  |  |  |  | 786.9 |  |
Total Gains (Losses) Included in AOCI |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Purchases |  | 0.0 |  | 1.5 |  | 0.0 |  | 1.5 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0.0 |  | 13.5 |  | 0.0 |  | 13.5 |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | 0.0 | [1] | $ 0.0 | [2] | 0.0 | [3] | $ 0.0 | [4] |  |  |  |
Equity Securities [Member] | Equity Securities Available For Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 22.9 |  |  |  | 22.9 |  |  |  |  | 23.0 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax |  | (4.4) |  |  |  | (4.4) |  |  |  |  | (5.1) |  |
Available-for-sale Securities, Equity Securities |  | 579.6 |  |  |  | 579.6 |  |  |  |  | 663.6 |  |
Total investments, Carrying Value |  | 579.6 |  |  |  | 579.6 |  |  |  |  | 663.6 |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | 561.1 |  |  |  | 561.1 |  |  |  |  | 645.7 |  |
Equity Securities [Member] | Held for trading [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax |  | 23.2 |  |  |  | 23.2 |  |  |  |  | 8.2 |  |
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  |  |  |  |  |  |  | (44.9) |  |
Available-for-sale Securities, Equity Securities |  | 41.9 |  |  |  | 41.9 |  |  |  |  | 104.5 |  |
Total investments, Carrying Value |  | 41.9 |  |  |  | 41.9 |  |  |  |  | 104.5 |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | 18.7 |  |  |  | 18.7 |  |  |  |  | 141.2 |  |
Fixed-maturity securities, available-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 613.6 |  |  |  | 613.6 |  |  |  |  | 846.5 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (278.5) |  |  |  | (278.5) |  |  |  |  | (103.7) |  |
Available-for-sale Securities, Debt Securities |  | 17,723.6 |  |  |  | 17,723.6 |  |  |  |  | 17,211.5 |  |
Total investments, Carrying Value |  | 17,723.6 |  |  |  | 17,723.6 |  |  |  |  | 17,211.5 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 17,388.5 |  |  |  | 17,388.5 |  |  |  |  | 16,468.7 |  |
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 |  | 4.9 |  |  |  | 4.9 |  |  |  |  | 10.9 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (24.1) |  |  |  | (24.1) |  |  |  |  | (18.8) |  |
Available-for-sale Securities, Debt Securities |  | 1,887.5 |  |  |  | 1,887.5 |  |  |  |  | 1,792.9 |  |
Total investments, Carrying Value |  | 1,887.5 |  |  |  | 1,887.5 |  |  |  |  | 1,792.9 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,906.7 |  |  |  | 1,906.7 |  |  |  |  | 1,800.8 |  |
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 |  | 14.4 |  |  |  | 14.4 |  |  |  |  | 21.3 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (7.0) |  |  |  | (7.0) |  |  |  |  | (2.0) |  |
Available-for-sale Securities, Debt Securities |  | 821.6 |  |  |  | 821.6 |  |  |  |  | 636.9 |  |
Total investments, Carrying Value |  | 821.6 |  |  |  | 821.6 |  |  |  |  | 636.9 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 814.2 |  |  |  | 814.2 |  |  |  |  | 617.6 |  |
Fixed-maturity securities, available-for-sale [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 346.2 |  |  |  | 346.2 |  |  |  |  | 499.2 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (173.6) |  |  |  | (173.6) |  |  |  |  | (48.9) |  |
Available-for-sale Securities, Debt Securities |  | 9,551.1 |  |  |  | 9,551.1 |  |  |  |  | 9,795.8 |  |
Total investments, Carrying Value |  | 9,551.1 |  |  |  | 9,551.1 |  |  |  |  | 9,795.8 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 9,378.5 |  |  |  | 9,378.5 |  |  |  |  | 9,345.5 |  |
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 |  | 46.4 |  |  |  | 46.4 |  |  |  |  | 52.2 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (28.9) |  |  |  | (28.9) |  |  |  |  | (15.2) |  |
Available-for-sale Securities, Debt Securities |  | 1,241.1 |  |  |  | 1,241.1 |  |  |  |  | 1,316.1 |  |
Total investments, Carrying Value |  | 1,241.1 |  |  |  | 1,241.1 |  |  |  |  | 1,316.1 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,223.6 |  |  |  | 1,223.6 |  |  |  |  | 1,279.1 |  |
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 |  | 91.9 |  |  |  | 91.9 |  |  |  |  | 116.2 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (19.8) |  |  |  | (19.8) |  |  |  |  | (6.3) |  |
Available-for-sale Securities, Debt Securities |  | 1,450.6 |  |  |  | 1,450.6 |  |  |  |  | 1,259.8 |  |
Total investments, Carrying Value |  | 1,450.6 |  |  |  | 1,450.6 |  |  |  |  | 1,259.8 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,378.5 |  |  |  | 1,378.5 |  |  |  |  | 1,149.9 |  |
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 |  | 100.6 |  |  |  | 100.6 |  |  |  |  | 140.3 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (24.7) |  |  |  | (24.7) |  |  |  |  | (11.1) |  |
Available-for-sale Securities, Debt Securities |  | 2,175.4 |  |  |  | 2,175.4 |  |  |  |  | 2,114.0 |  |
Total investments, Carrying Value |  | 2,175.4 |  |  |  | 2,175.4 |  |  |  |  | 2,114.0 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 2,099.5 |  |  |  | 2,099.5 |  |  |  |  | 1,984.8 |  |
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 |  | 9.2 |  |  |  | 9.2 |  |  |  |  | 6.4 |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.4) |  |  |  | (0.4) |  |  |  |  | (1.4) |  |
Available-for-sale Securities, Debt Securities |  | 596.3 |  |  |  | 596.3 |  |  |  |  | 296.0 |  |
Total investments, Carrying Value |  | 596.3 |  |  |  | 596.3 |  |  |  |  | 296.0 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 587.5 |  |  |  | 587.5 |  |  |  |  | 291.0 |  |
Derivative Financial Instruments, Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost |  | 211.9 |  |  |  | 211.9 |  |  |  |  | 177.7 |  |
Trading Securities |  | 220.4 |  |  |  | 220.4 |  |  |  |  | 296.3 |  |
Other Investments Gross Unrealized Gain |  | 47.0 |  |  |  | 47.0 |  |  |  |  | 123.3 |  |
Other Short Term Investments Gross Unrealized Losses |  | (38.5) |  |  |  | (38.5) |  |  |  |  | (4.7) |  |
Asset based loan receivables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost |  | 490.0 |  |  |  | 490.0 |  |  |  |  | 811.6 |  |
Trading Securities |  | 490.0 |  |  |  | 490.0 |  |  |  |  | 811.6 |  |
Other Invested Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost |  |  |  |  |  |  |  |  |  |  | 164.9 |  |
Trading Securities |  |  |  |  |  |  |  |  |  |  | 165.0 |  |
Other Investments Gross Unrealized Gain |  |  |  |  |  |  |  |  |  |  | $ 0.1 |  |
Other Invested Assets [Member] | Other Investments Asset [Member] | All Other Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Securities, Cost |  | 442.4 |  |  |  | 442.4 |  |  |  |  |  |  |
Trading Securities |  | 442.4 |  |  |  | 442.4 |  |  |  |  |  |  |
Other Investments Gross Unrealized Gain |  | 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |
Other Short Term Investments Gross Unrealized Losses |  | $ 0.0 |  |  |  | $ 0.0 |  |  |  |  |  |  |
[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.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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