v2.4.0.6

Investments - Schedule of Investments (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 4,787,700,000 | $ 4,773,400,000
Fair Value | 429,600,000 | 397,300,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due in One Year or Less | 75,100,000 |
Due after One Year to Five Years | 505,700,000 |
Due after Five Years to Ten Years | 966,600,000 |
Due after Ten Years | 2,966,900,000 |
Asset-backed Securities Not Due in a Single Maturity Date | 273,400,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 214,800,000 | 259,500,000
Less Than 12 Months, Unrealized Losses | (8,000,000) | (16,700,000)
12 Months or Longer, Fair Value | 71,600,000 | 94,600,000
12 Months or Longer, Unrealized Losses | (4,900,000) | (6,600,000)
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
Total, Fair Value | 286,400,000 | 354,100,000
Total, Unrealized Losses | (12,900,000) | (23,300,000)
Available For Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment | 100,000 | 200,000
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 Possition Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency impairment | 1 | 1
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 4,297,600,000 | 4,266,100,000
Gross Unrealized Gains | 499,600,000 | 518,400,000
Gross Unrealized Losses | (9,500,000) | (11,100,000)
Fair Value | 4,787,700,000 | 4,773,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 190,400,000 | 173,500,000
Less Than 12 Months, Unrealized Losses | (5,000,000) | (5,200,000)
12 Months or Longer, Fair Value | 66,300,000 | 89,500,000
12 Months or Longer, Unrealized Losses | (4,500,000) | (5,900,000)
Total, Fair Value | 256,700,000 | 263,000,000
Total, Unrealized Losses | (9,500,000) | (11,100,000)
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 429,100,000 | 439,400,000
Gross Unrealized Gains | 45,900,000 | 52,300,000
Gross Unrealized Losses | (600,000) | 0
Fair Value | 474,400,000 | 491,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 19,700,000 | 1,300,000
Less Than 12 Months, Unrealized Losses | (600,000) | 0
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 19,700,000 | 1,300,000
Total, Unrealized Losses | (600,000) | 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 | 241,600,000 |
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 | 26,000,000 |
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 | 800,000 |
Other Issuers [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date | 5,000,000 |
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 1,666,600,000 | 1,705,000,000
Gross Unrealized Gains | 159,300,000 | 148,400,000
Gross Unrealized Losses | (500,000) | (800,000)
Fair Value | 1,825,400,000 | 1,852,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 2,000,000
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 12,300,000 | 12,000,000
12 Months or Longer, Unrealized Losses | (500,000) | (800,000)
Total, Fair Value | 12,300,000 | 14,000,000
Total, Unrealized Losses | (500,000) | (800,000)
Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 2,120,400,000 | 2,040,100,000
Gross Unrealized Gains | 288,600,000 | 311,600,000
Gross Unrealized Losses | (7,500,000) | (9,400,000)
Fair Value | 2,401,500,000 | 2,342,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 170,200,000 | 169,600,000
Less Than 12 Months, Unrealized Losses | (4,200,000) | (5,100,000)
12 Months or Longer, Fair Value | 51,300,000 | 74,700,000
12 Months or Longer, Unrealized Losses | (3,300,000) | (4,300,000)
Total, Fair Value | 221,500,000 | 244,300,000
Total, Unrealized Losses | (7,500,000) | (9,400,000)
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 76,800,000 | 76,700,000
Gross Unrealized Gains | 4,800,000 | 5,100,000
Gross Unrealized Losses | (200,000) | (100,000)
Fair Value | 81,400,000 | 81,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 500,000 | 600,000
Less Than 12 Months, Unrealized Losses | (200,000) | (100,000)
12 Months or Longer, Fair Value | 100,000 | 100,000
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 600,000 | 700,000
Total, Unrealized Losses | (200,000) | (100,000)
Mortgage and Asset-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 4,700,000 | 4,900,000
Gross Unrealized Gains | 1,000,000 | 1,000,000
Gross Unrealized Losses | (700,000) | (800,000)
Fair Value | 5,000,000 | 5,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months or Longer, Fair Value | 2,600,000 | 2,700,000
12 Months or Longer, Unrealized Losses | (700,000) | (800,000)
Total, Fair Value | 2,600,000 | 2,700,000
Total, Unrealized Losses | (700,000) | (800,000)
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,900,000 | 2,900,000
Non-governmental Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,700,000 | 1,700,000
Other Asset Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 400,000 | 400,000
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value |  | 100,000
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 380,400,000 | 367,300,000
Gross Unrealized Gains | 52,600,000 | 42,200,000
Gross Unrealized Losses | (3,400,000) | (12,200,000)
Fair Value | 429,600,000 | 397,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 24,400,000 | 86,000,000
Less Than 12 Months, Unrealized Losses | (3,000,000) | (11,500,000)
12 Months or Longer, Fair Value | 5,300,000 | 5,100,000
12 Months or Longer, Unrealized Losses | (400,000) | (700,000)
Total, Fair Value | 29,700,000 | 91,100,000
Total, Unrealized Losses | (3,400,000) | (12,200,000)
Preferred Stock Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 94,400,000 | 94,400,000
Gross Unrealized Gains | 3,300,000 | 1,000,000
Gross Unrealized Losses | (300,000) | (8,700,000)
Fair Value | 97,400,000 | 86,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 54,900,000
Less Than 12 Months, Unrealized Losses | 0 | (8,100,000)
12 Months or Longer, Fair Value | 2,400,000 | 2,200,000
12 Months or Longer, Unrealized Losses | (300,000) | (600,000)
Total, Fair Value | 2,400,000 | 57,100,000
Total, Unrealized Losses | (300,000) | (8,700,000)
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 18,100,000 | 18,000,000
Gross Unrealized Gains | 3,400,000 | 2,600,000
Gross Unrealized Losses | (300,000) | (100,000)
Fair Value | 21,200,000 | 20,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,800,000 | 1,800,000
Less Than 12 Months, Unrealized Losses | (200,000) | 0
12 Months or Longer, Fair Value | 2,800,000 | 2,800,000
12 Months or Longer, Unrealized Losses | (100,000) | (100,000)
Total, Fair Value | 4,600,000 | 4,600,000
Total, Unrealized Losses | (300,000) | (100,000)
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 65,300,000 | 64,600,000
Gross Unrealized Gains | 21,900,000 | 18,900,000
Gross Unrealized Losses | (100,000) | (100,000)
Fair Value | 87,100,000 | 83,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,200,000 | 1,500,000
Less Than 12 Months, Unrealized Losses | (100,000) | (100,000)
12 Months or Longer, Fair Value | 0 | 100,000
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 1,200,000 | 1,600,000
Total, Unrealized Losses | (100,000) | (100,000)
Common Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 41,400,000 | 41,400,000
Gross Unrealized Gains | 8,900,000 | 7,400,000
Gross Unrealized Losses | (600,000) | (1,800,000)
Fair Value | 49,700,000 | 47,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 5,400,000 | 10,700,000
Less Than 12 Months, Unrealized Losses | (600,000) | (1,800,000)
12 Months or Longer, Fair Value | 100,000 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 5,500,000 | 10,700,000
Total, Unrealized Losses | (600,000) | (1,800,000)
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 66,000,000 | 66,000,000
Gross Unrealized Gains | 1,700,000 | 600,000
Gross Unrealized Losses | 0 | 0
Fair Value | 67,700,000 | 66,600,000
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 95,200,000 | 82,900,000
Gross Unrealized Gains | 13,400,000 | 11,700,000
Gross Unrealized Losses | (2,100,000) | (1,500,000)
Fair Value | 106,500,000 | 93,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 16,000,000 | 17,100,000
Less Than 12 Months, Unrealized Losses | (2,100,000) | (1,500,000)
12 Months or Longer, Fair Value | 0 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 16,000,000 | 17,100,000
Total, Unrealized Losses | (2,100,000) | (1,500,000)
External Credit Rating, Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | (6,500,000) | (5,700,000)
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 Foregin Currency Impairment | (100,000) | (200,000)
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average | 3.00% | 4.00%
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | $ (3,000,000) | $ (5,400,000)

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