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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
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Jun. 30, 2013 Security | Sep. 30, 2012 Security
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Jun. 30, 2013 |
Available-for-sale securities, Fair Value, Less than 12 months | $ 4,436.9 | $ 681.1
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (185.8) | (11.9)
Available-for-sale securities, Fair Value, 12 months or longer | 725.1 | 323.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 31.7 | 18.7
Available-for-sale securities, Fair Value, Total | 5,162.0 | 1,004.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (217.5) | (30.6)
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months | 537 | 100
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer |  | 56
Total number of available-for-sale securities in an unrealized loss position |  | 156
Asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 300.6 | 169.8
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (4.1) | (1.0)
Available-for-sale securities, Fair Value, 12 months or longer | 77.6 | 7.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 0.5 | 0.6
Available-for-sale securities, Fair Value, Total | 378.2 | 177.3
Available-for-sale Securities, Gross Unrealized Losses, Total | (4.6) | (1.6)
Commercial mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 28.7 | 0.8
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (0.3) | (0.8)
Available-for-sale securities, Fair Value, 12 months or longer | 0 | 10.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 0.4 | 1.6
Available-for-sale securities, Fair Value, Total | 28.7 | 11.5
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.7) | (2.4)
Corporates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 3,133.5 | 411.3
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (142.4) | (8.1)
Available-for-sale securities, Fair Value, 12 months or longer | 396.0 | 45.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 21.1 | 1.9
Available-for-sale securities, Fair Value, Total | 3,529.5 | 456.8
Available-for-sale Securities, Gross Unrealized Losses, Total | (163.5) | (10.0)
Equities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 90.9 |
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (3.2) |
Available-for-sale securities, Fair Value, 12 months or longer | 33.9 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 1.4 | 1.3
Available-for-sale securities, Fair Value, Total | 124.8 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, Total | (4.6) | (1.3)
Hybrids [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 75.4 | 13.4
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | 2.5 | (0.4)
Available-for-sale securities, Fair Value, 12 months or longer | 40.7 | 107.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.6) | 9.2
Available-for-sale securities, Fair Value, Total | 116.1 | 121.1
Available-for-sale Securities, Gross Unrealized Losses, Total | 3.1 | (9.6)
Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 350.9 | 71.1
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (21.4) | (1.1)
Available-for-sale securities, Fair Value, 12 months or longer | 101.4 |
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 6.0 |
Available-for-sale securities, Fair Value, Total | 452.3 | 71.1
Available-for-sale Securities, Gross Unrealized Losses, Total | (27.4) | (1.1)
Agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 2.5 | 1.8
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | 0 | (0.2)
Available-for-sale securities, Fair Value, 12 months or longer | 6.3 | 6.1
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 0.4 | 0.1
Available-for-sale securities, Fair Value, Total | 8.8 | 7.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.4) | (0.3)
Non-agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 255.5 | 12.9
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (8.0) | (0.3)
Available-for-sale securities, Fair Value, 12 months or longer | 69.2 | 101.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 1.3 | 4.0
Available-for-sale securities, Fair Value, Total | 324.7 | 114.7
Available-for-sale Securities, Gross Unrealized Losses, Total | (9.3) | (4.3)
U.S. Government securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 198.9 |
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (3.9) |
Available-for-sale securities, Fair Value, 12 months or longer | 0 |
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | 0 |
Available-for-sale securities, Fair Value, Total | 198.9 |
Available-for-sale Securities, Gross Unrealized Losses, Total | $ (3.9) |

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