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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 Security | Sep. 30, 2012 Security
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | $ 1,425.8 | $ 681.1
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (15.1) | (11.9)
Available-for-sale securities, Fair Value, 12 months or longer | 251.9 | 323.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (4.8) | (18.7)
Available-for-sale securities, Fair Value, Total | 1,677.7 | 1,004.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (19.9) | (30.6)
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months | 213 | 100
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer | 51 | 56
Total number of available-for-sale securities in an unrealized loss position | 264 | 156
Asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 116.3 | 169.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.5) | (1.0)
Available-for-sale securities, Fair Value, 12 months or longer | 21.8 | 7.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.2) | (0.6)
Available-for-sale securities, Fair Value, Total | 138.1 | 177.3
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.7) | (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 |  | 0.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months |  | (0.8)
Available-for-sale securities, Fair Value, 12 months or longer | 0.2 | 10.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.5) | (1.6)
Available-for-sale securities, Fair Value, Total | 0.2 | 11.5
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.5) | (2.4)
Corporates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 1,044.4 | 411.3
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (11.2) | (8.1)
Available-for-sale securities, Fair Value, 12 months or longer | 125.3 | 45.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (1.8) | (1.9)
Available-for-sale securities, Fair Value, Total | 1,169.7 | 456.8
Available-for-sale Securities, Gross Unrealized Losses, Total | (13.0) | (10.0)
Equities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 17.7 |
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.7) |
Available-for-sale securities, Fair Value, 12 months or longer | 32.2 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (1.2) | (1.3)
Available-for-sale securities, Fair Value, Total | 49.9 | 44.5
Available-for-sale Securities, Gross Unrealized Losses, Total | (1.9) | (1.3)
Hybrids [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months |  | 13.4
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months |  | (0.4)
Available-for-sale securities, Fair Value, 12 months or longer |  | 107.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer |  | (9.2)
Available-for-sale securities, Fair Value, Total |  | 121.1
Available-for-sale Securities, Gross Unrealized Losses, Total |  | (9.6)
Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 79.1 | 71.1
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.8) | (1.1)
Available-for-sale securities, Fair Value, 12 months or longer |  |
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer |  |
Available-for-sale securities, Fair Value, Total | 79.1 | 71.1
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.8) | (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 | 4.9 | 1.8
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.2) | (0.2)
Available-for-sale securities, Fair Value, 12 months or longer | 4.1 | 6.1
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.1) | (0.1)
Available-for-sale securities, Fair Value, Total | 9.0 | 7.9
Available-for-sale Securities, Gross Unrealized Losses, Total | (0.3) | (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 | 143.4 | 12.9
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (1.6) | (0.3)
Available-for-sale securities, Fair Value, 12 months or longer | 68.3 | 101.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (1.0) | (4.0)
Available-for-sale securities, Fair Value, Total | 211.7 | 114.7
Available-for-sale Securities, Gross Unrealized Losses, Total | (2.6) | (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 | 20.0 |
Available-for-sale Securities, Gross Unrealized Losses, Less than 12 Months | (0.1) |
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 | 20.0 |
Available-for-sale Securities, Gross Unrealized Losses, Total | $ (0.1) |

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