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Investments - Schedule of Investments (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 4,416.3 |
Amortized Cost Basis | 477.2 | 462.7
Fixed Maturities at Fair Value | 4,701.1 | 4,860.2
Fair Value | 545.0 | 521.9
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due in One Year or Less - Amortized Cost | 115.0 |
Due in One Year or Less - Fair Value | 117.8 |
Due after One Year to Five Years - Amortized Cost | 641.9 |
Due after One Year to Five Years - Fair Value | 675.9 |
Due after Five Years to Ten Years - Amortized Cost | 1,259.5 |
Due after Five Years to Ten Years - Fair Value | 1,295.9 |
Due after Ten Years - Amortized Cost | 2,182.3 |
Due after Ten Years - Fair Value | 2,383.4 |
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost | 217.6 |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 228.1 |
Other Receivables | 206.2 | 206.1
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,248.4 | 343.9
Less Than 12 Months, Unrealized Losses | (68.0) | (7.6)
12 Months or Longer, Fair Value | 71.4 | 54.6
12 Months or Longer, Unrealized Losses | (4.7) | (3.8)
Total, Fair Value | 1,319.8 | 398.5
Total, Unrealized Losses | (72.7) | (11.4)
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 | (0.5) | 0
Less Than 12 Months, Fair Value | (1.3) | (0.3)
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 |
Other Liabilities | 448.5 | 431.4
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,416.3 | 4,283.8
Gross Unrealized Gains | 351.4 | 584.5
Gross Unrealized Losses | (66.6) | (8.1)
Fixed Maturities at Fair Value | 4,701.1 | 4,860.2
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Other Receivables | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,084.0 | 315.6
Less Than 12 Months, Unrealized Losses | (62.7) | (5.5)
12 Months or Longer, Fair Value | 61.6 | 40.5
12 Months or Longer, Unrealized Losses | (3.9) | (2.6)
Total, Fair Value | 1,145.6 | 356.1
Total, Unrealized Losses | (66.6) | (8.1)
Other Liabilities | 6.2 | 1.5
Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed Maturities at Fair Value | 29.8 |
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 372.5 | 384.0
Gross Unrealized Gains | 29.8 | 45.1
Gross Unrealized Losses | (7.1) | (0.2)
Fixed Maturities at Fair Value | 395.2 | 428.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 89.5 | 40.8
Less Than 12 Months, Unrealized Losses | (7.1) | (0.2)
12 Months or Longer, Fair Value | 0.1 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 89.6 | 40.8
Total, Unrealized Losses | (7.1) | (0.2)
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 | 175.3 |
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 | 14.3 |
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 | 0.5 |
Other Issuers [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 38.0 |
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,333.7 | 1,251.0
Gross Unrealized Gains | 83.6 | 150.5
Gross Unrealized Losses | (16.1) | (0.1)
Fixed Maturities at Fair Value | 1,401.2 | 1,401.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 216.8 | 6.3
Less Than 12 Months, Unrealized Losses | (16.1) | (0.1)
12 Months or Longer, Fair Value | 0.3 | 0.3
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 217.1 | 6.6
Total, Unrealized Losses | (16.1) | (0.1)
Foreign Government Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 0.6 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fixed Maturities at Fair Value | 0.6 |
Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,669.9 | 2,615.5
Gross Unrealized Gains | 234.3 | 385.4
Gross Unrealized Losses | (42.4) | (7.5)
Fixed Maturities at Fair Value | 2,861.8 | 2,993.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 754.4 | 268.5
Less Than 12 Months, Unrealized Losses | (38.6) | (5.2)
12 Months or Longer, Fair Value | 59.6 | 38.1
12 Months or Longer, Unrealized Losses | (3.8) | (2.3)
Total, Fair Value | 814.0 | 306.6
Total, Unrealized Losses | (42.4) | (7.5)
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2.1 | 30.1
Gross Unrealized Gains | 2.2 | 2.5
Gross Unrealized Losses | 0 | 0
Fixed Maturities at Fair Value | 4.3 | 32.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value |  | 0
Less Than 12 Months, Unrealized Losses |  | 0
12 Months or Longer, Fair Value |  | 0.4
12 Months or Longer, Unrealized Losses |  | 0
Total, Fair Value |  | 0.4
Total, Unrealized Losses |  | 0
Mortgage and Asset-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 37.5 | 3.2
Gross Unrealized Gains | 1.5 | 1.0
Gross Unrealized Losses | (1.0) | (0.3)
Fixed Maturities at Fair Value | 38.0 | 3.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 23.3 | 0
Less Than 12 Months, Unrealized Losses | (0.9) | 0
12 Months or Longer, Fair Value | 1.6 | 1.7
12 Months or Longer, Unrealized Losses | (0.1) | (0.3)
Total, Fair Value | 24.9 | 1.7
Total, Unrealized Losses | (1.0) | (0.3)
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed Maturities at Fair Value | 6.7 | 2.3
Non-governmental Residential Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed Maturities at Fair Value | 1.2 | 1.3
Other Asset Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed Maturities at Fair Value | 0.3 | 0.3
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 477.2 | 462.7
Gross Unrealized Gains | 73.9 | 62.5
Gross Unrealized Losses | (6.1) | (3.3)
Fair Value | 545.0 | 521.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 164.4 | 28.3
Less Than 12 Months, Unrealized Losses | (5.3) | (2.1)
12 Months or Longer, Fair Value | 9.8 | 14.1
12 Months or Longer, Unrealized Losses | (0.8) | (1.2)
Total, Fair Value | 174.2 | 42.4
Total, Unrealized Losses | (6.1) | (3.3)
Preferred Stock Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 75.4 | 75.4
Gross Unrealized Gains | 3.3 | 3.9
Gross Unrealized Losses | (0.9) | (0.1)
Fair Value | 77.8 | 79.2
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 14.2 | 0
Less Than 12 Months, Unrealized Losses | (0.8) | 0
12 Months or Longer, Fair Value | 2.4 | 2.4
12 Months or Longer, Unrealized Losses | (0.1) | (0.1)
Total, Fair Value | 16.6 | 2.4
Total, Unrealized Losses | (0.9) | (0.1)
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 14.5 | 18.4
Gross Unrealized Gains | 5.3 | 3.8
Gross Unrealized Losses | (0.5) | (0.9)
Fair Value | 19.3 | 21.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1.4 | 2.3
Less Than 12 Months, Unrealized Losses | (0.5) | (0.8)
12 Months or Longer, Fair Value | 0.7 | 3.7
12 Months or Longer, Unrealized Losses | 0 | (0.1)
Total, Fair Value | 2.1 | 6.0
Total, Unrealized Losses | (0.5) | (0.9)
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 67.3 | 67.0
Gross Unrealized Gains | 27.9 | 20.9
Gross Unrealized Losses | (0.2) | (0.4)
Fair Value | 95.0 | 87.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 2.5 | 6.3
Less Than 12 Months, Unrealized Losses | (0.2) | (0.4)
12 Months or Longer, Fair Value | 0.2 | 0
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 2.7 | 6.3
Total, Unrealized Losses | (0.2) | (0.4)
Common Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 49.8 | 59.1
Gross Unrealized Gains | 17.2 | 8.1
Gross Unrealized Losses | (0.4) | (0.5)
Fair Value | 66.6 | 66.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 2.2 | 14.2
Less Than 12 Months, Unrealized Losses | (0.4) | (0.4)
12 Months or Longer, Fair Value | 0.5 | 1.3
12 Months or Longer, Unrealized Losses | 0 | (0.1)
Total, Fair Value | 2.7 | 15.5
Total, Unrealized Losses | (0.4) | (0.5)
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 140.2 | 119.6
Gross Unrealized Gains | 0.3 | 6.3
Gross Unrealized Losses | (1.5) | 0
Fair Value | 139.0 | 125.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 82.2 |
Less Than 12 Months, Unrealized Losses | (1.5) |
12 Months or Longer, Fair Value | 0 |
12 Months or Longer, Unrealized Losses | 0 |
Total, Fair Value | 82.2 |
Total, Unrealized Losses | (1.5) |
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost Basis | 130.0 | 123.2
Gross Unrealized Gains | 19.9 | 19.5
Gross Unrealized Losses | (2.6) | (1.4)
Fair Value | 147.3 | 141.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 61.9 | 5.5
Less Than 12 Months, Unrealized Losses | (1.9) | (0.5)
12 Months or Longer, Fair Value | 6.0 | 6.7
12 Months or Longer, Unrealized Losses | (0.7) | (0.9)
Total, Fair Value | 67.9 | 12.2
Total, Unrealized Losses | (2.6) | (1.4)
External Credit Rating, Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | 61.3 | 3.8
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total, Unrealized Losses | 5.3 | 4.3
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency Impairment | $ (0.1) | $ (0.1)
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
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average | 5.00% | 3.00%

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