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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Security | Sep. 30, 2014 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Jun. 30, 2015 |
Available-for-sale securities, Fair Value, Less than 12 months | $ 5,297.0 | $ 2,577.1
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (176.4) | (39.4)
Available-for-sale securities, Fair Value, 12 months or longer | 2,519.9 | 2,285.5
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (106.5) | (69.4)
Available-for-sale securities, Fair Value, Total | 7,816.9 | 4,862.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 282.9 | $ 108.8
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months | Security | 783 | 319
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer | Security | 300 | 310
Total number of available-for-sale securities in an unrealized loss position | Security | 1,083 | 629
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | $ 725.9 | $ 825.8
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (10.2) | (11.8)
Available-for-sale securities, Fair Value, 12 months or longer | 597.4 | 288.2
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (13.9) | (7.0)
Available-for-sale securities, Fair Value, Total | 1,323.3 | 1,114.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 24.1 | 18.8
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 318.9 | 160.3
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (6.9) | (0.9)
Available-for-sale securities, Fair Value, 12 months or longer | 56.8 | 0.4
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.1) | (1.1)
Available-for-sale securities, Fair Value, Total | 375.7 | 160.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7.0 | 2.0
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 2,832.7 | 816.6
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (127.3) | (16.3)
Available-for-sale securities, Fair Value, 12 months or longer | 893.8 | 1,127.8
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (46.3) | (32.6)
Available-for-sale securities, Fair Value, Total | 3,726.5 | 1,944.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 173.6 | 48.9
Equities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 59.9 | 180.4
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (1.3) | (2.2)
Available-for-sale securities, Fair Value, 12 months or longer | 94.6 | 54.9
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (3.1) | (2.9)
Available-for-sale securities, Fair Value, Total | 154.5 | 235.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4.4 | 5.1
Hybrids [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 174.1 | 258.2
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (5.2) | (2.3)
Available-for-sale securities, Fair Value, 12 months or longer | 360.9 | 290.0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (23.7) | (12.9)
Available-for-sale securities, Fair Value, Total | 535.0 | 548.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 28.9 | 15.2
Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 339.4 |
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (12.8) |
Available-for-sale securities, Fair Value, 12 months or longer | 210.9 | 264.9
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (7.0) | (6.3)
Available-for-sale securities, Fair Value, Total | 550.3 | 264.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 19.8 | 6.3
Agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 496.2 | 298.5
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses | (12.7) | (5.8)
Available-for-sale securities, Fair Value, 12 months or longer | 246.2 | 177.6
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (12.0) | (5.3)
Available-for-sale securities, Fair Value, Total | 742.4 | 476.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 24.7 | 11.1
U.S. Government securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, Fair Value, Less than 12 months | 349.9 | 37.3
Available For Sale Securities In A Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses |  | (0.1)
Available-for-sale securities, Fair Value, 12 months or longer | 59.3 | 81.7
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer | (0.4) | (1.3)
Available-for-sale securities, Fair Value, Total | 409.2 | 119.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0.4 | $ 1.4

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