v2.4.0.6

Investments - Schedule of Investments (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | $ 4,129.5 |
Fair Value | 4,725.6 | 4,773.4
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due in One Year or Less - Amortized Cost | 49.8 |
Due in One Year or Less - Fair Value | 49.9 |
Due after One Year to Five Years - Amortized Cost | 549.1 |
Due after One Year to Five Years - Fair Value | 581.8 |
Due after Five Years to Ten Years - Amortized Cost | 1,045.6 |
Due after Five Years to Ten Years - Fair Value | 1,160.7 |
Due after Ten Years - Amortized Cost | 2,271.1 |
Due after Ten Years - Fair Value | 2,695.9 |
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost | 213.9 |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 237.3 |
Other Receivables | 207.6 | 218.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 228.3 | 259.5
Less Than 12 Months, Unrealized Losses | (4.9) | (16.7)
12 Months or Longer, Fair Value | 64.1 | 94.6
12 Months or Longer, Unrealized Losses | (5.7) | (6.6)
Total, Fair Value | 292.4 | 354.1
Total, Unrealized Losses | (10.6) | (23.3)
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securites in An Unrealized Loss Position, In a Position of 12 Months or Longer |  | 0
Available For Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency Impairment | 0.1 | 0.2
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securites in An Unrealized Loss Position | 0 |
Number of Issuers of Available for Sales Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency impairment | 1 | 1
Other Liabilities | 440.1 | 403.3
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 4,129.5 | 4,266.1
Gross Unrealized Gains | 603.5 | 518.4
Gross Unrealized Losses | (7.4) | (11.1)
Fair Value | 4,725.6 | 4,773.4
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Other Receivables | 5.1 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 212.4 | 173.5
Less Than 12 Months, Unrealized Losses | (3.6) | (5.2)
12 Months or Longer, Fair Value | 44.2 | 89.5
12 Months or Longer, Unrealized Losses | (3.8) | (5.9)
Total, Fair Value | 256.6 | 263.0
Total, Unrealized Losses | (7.4) | (11.1)
Other Liabilities | 23.3 | 0
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 406.3 | 439.4
Gross Unrealized Gains | 50.6 | 52.3
Gross Unrealized Losses | (0.3) | 0
Fair Value | 456.6 | 491.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 40.0 | 1.3
Less Than 12 Months, Unrealized Losses | (0.3) | 0
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 40.0 | 1.3
Total, Unrealized Losses | (0.3) | 0
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 209.9 |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 22.0 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 0.7 |
Other Issuers [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 4.7 |
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 1,280.6 | 1,705.0
Gross Unrealized Gains | 155.4 | 148.4
Gross Unrealized Losses | 0 | (0.8)
Fair Value | 1,436.0 | 1,852.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 2.0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 0.7 | 12.0
12 Months or Longer, Unrealized Losses | 0 | (0.8)
Total, Fair Value | 0.7 | 14.0
Total, Unrealized Losses | 0 | (0.8)
Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 2,399.8 | 2,040.1
Gross Unrealized Gains | 393.2 | 311.6
Gross Unrealized Losses | (6.4) | (9.4)
Fair Value | 2,786.6 | 2,342.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 172.3 | 169.6
Less Than 12 Months, Unrealized Losses | (3.3) | (5.1)
12 Months or Longer, Fair Value | 40.3 | 74.7
12 Months or Longer, Unrealized Losses | (3.1) | (4.3)
Total, Fair Value | 212.6 | 244.3
Total, Unrealized Losses | (6.4) | (9.4)
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 38.6 | 76.7
Gross Unrealized Gains | 3.3 | 5.1
Gross Unrealized Losses | (0.2) | (0.1)
Fair Value | 41.7 | 81.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 0.6
Less Than 12 Months, Unrealized Losses | 0 | (0.1)
12 Months or Longer, Fair Value | 0.7 | 0.1
12 Months or Longer, Unrealized Losses | (0.2) | 0
Total, Fair Value | 0.7 | 0.7
Total, Unrealized Losses | (0.2) | (0.1)
Mortgage and Asset-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 4.2 | 4.9
Gross Unrealized Gains | 1.0 | 1.0
Gross Unrealized Losses | (0.5) | (0.8)
Fair Value | 4.7 | 5.1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0.1 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 2.5 | 2.7
12 Months or Longer, Unrealized Losses | (0.5) | (0.8)
Total, Fair Value | 2.6 | 2.7
Total, Unrealized Losses | (0.5) | (0.8)
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2.9 | 2.9
Non-governmental Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1.5 | 1.7
Other Asset Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 0.3 | 0.4
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value |  | 0.1
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 481.4 | 367.3
Gross Unrealized Gains | 67.5 | 42.2
Gross Unrealized Losses | (3.2) | (12.2)
Fair Value | 545.7 | 397.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 15.9 | 86.0
Less Than 12 Months, Unrealized Losses | (1.3) | (11.5)
12 Months or Longer, Fair Value | 19.9 | 5.1
12 Months or Longer, Unrealized Losses | (1.9) | (0.7)
Total, Fair Value | 35.8 | 91.1
Total, Unrealized Losses | (3.2) | (12.2)
Preferred Stock Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 80.4 | 94.4
Gross Unrealized Gains | 4.5 | 1.0
Gross Unrealized Losses | (0.2) | (8.7)
Fair Value | 84.7 | 86.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 54.9
Less Than 12 Months, Unrealized Losses | 0 | (8.1)
12 Months or Longer, Fair Value | 2.3 | 2.2
12 Months or Longer, Unrealized Losses | (0.2) | (0.6)
Total, Fair Value | 2.3 | 57.1
Total, Unrealized Losses | (0.2) | (8.7)
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 18.4 | 18.0
Gross Unrealized Gains | 3.9 | 2.6
Gross Unrealized Losses | (0.1) | (0.1)
Fair Value | 22.2 | 20.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0.9 | 1.8
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 3.7 | 2.8
12 Months or Longer, Unrealized Losses | (0.1) | (0.1)
Total, Fair Value | 4.6 | 4.6
Total, Unrealized Losses | (0.1) | (0.1)
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 66.5 | 64.6
Gross Unrealized Gains | 23.9 | 18.9
Gross Unrealized Losses | (0.2) | (0.1)
Fair Value | 90.2 | 83.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 2.3 | 1.5
Less Than 12 Months, Unrealized Losses | (0.2) | (0.1)
12 Months or Longer, Fair Value | 0 | 0.1
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 2.3 | 1.6
Total, Unrealized Losses | (0.2) | (0.1)
Common Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 65.0 | 41.4
Gross Unrealized Gains | 13.0 | 7.4
Gross Unrealized Losses | (0.9) | (1.8)
Fair Value | 77.1 | 47.0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 4.7 | 10.7
Less Than 12 Months, Unrealized Losses | (0.3) | (1.8)
12 Months or Longer, Fair Value | 2.8 | 0
12 Months or Longer, Unrealized Losses | (0.6) | 0
Total, Fair Value | 7.5 | 10.7
Total, Unrealized Losses | (0.9) | (1.8)
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 144.6 | 66.0
Gross Unrealized Gains | 7.2 | 0.6
Gross Unrealized Losses | 0 | 0
Fair Value | 151.8 | 66.6
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 106.5 | 82.9
Gross Unrealized Gains | 15.0 | 11.7
Gross Unrealized Losses | (1.8) | (1.5)
Fair Value | 119.7 | 93.1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 8.0 | 17.1
Less Than 12 Months, Unrealized Losses | (0.8) | (1.5)
12 Months or Longer, Fair Value | 11.1 | 0
12 Months or Longer, Unrealized Losses | (1.0) | 0
Total, Fair Value | 19.1 | 17.1
Total, Unrealized Losses | (1.8) | (1.5)
External Credit Rating, Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | 2.3 | (5.7)
External Credit Rating, Non Investment Grade [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency Impairment | (0.1) | (0.2)
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | $ 5.1 | $ (5.4)
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average | 4.00% | 4.00%

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