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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 Security | Sep. 30, 2013 Security
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Sep. 30, 2014 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,577.1 | $ 5,405.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 39.4 | 235.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,285.5 | 520.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 69.4 | 28.0
Total, Fair Value | 4,862.6 | 5,925.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 108.8 | 263.9
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 319 | 588
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 310 | 78
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 629 | 666
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 825.8 | 329.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11.8 | 4.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 288.2 | 81.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7.0 | 0.7
Total, Fair Value | 1,114.0 | 410.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 18.8 | 5.2
Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 160.3 | 26.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.9 | 0.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0.4 | 4.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1.1 | 1.1
Total, Fair Value | 160.7 | 31.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2.0 | 1.6
Corporates |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 816.6 | 3,457.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16.3 | 175.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,127.8 | 186.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 32.6 | 10.1
Total, Fair Value | 1,944.4 | 3,643.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 48.9 | 185.1
Equities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 180.4 | 118.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.2 | 9.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 54.9 | 32.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2.9 | 1.2
Total, Fair Value | 235.3 | 150.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 5.1 | 10.3
Hybrids |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 258.2 | 52.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.3 | 3.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 290.0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12.9 |
Total, Fair Value | 548.2 | 52.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 15.2 | 3.3
Municipals |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 333.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 27.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 264.9 | 144.4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6.3 | 13.5
Total, Fair Value | 264.9 | 477.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 6.3 | 40.8
Agency Residential Mortgage Backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 24.1 | 9.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0.6 | 1.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0.2
Total, Fair Value | 24.7 | 10.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.1 | 0.3
Non-agency residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 274.4 | 325.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5.7 | 12.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 177.0 | 69.9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5.3 | 1.2
Total, Fair Value | 451.4 | 395.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 11.0 | 13.4
U.S. Government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 37.3 | 753.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 3.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 81.7 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1.3 |
Total, Fair Value | 119.0 | 753.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1.4 | $ 3.9

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