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Investments - Schedule of Investments (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 issuer | Dec. 31, 2012 issuer
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 4,391.4 |
Fixed Maturities at Fair Value | 4,645.0 | 4,860.2
Available for sale Securities, Equity Securities, Cost | 501.7 | 462.7
Available for sale Securities, Equity Securities, Fair Value | 567.4 | 521.9
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due in One Year or Less - Amortized Cost | 104.6 |
Due in One Year or Less - Fair Value | 108.7 |
Due after One Year to Five Years - Amortized Cost | 674.8 |
Due after One Year to Five Years - Fair Value | 713.7 |
Due after Five Years to Ten Years - Amortized Cost | 1,320.4 |
Due after Five Years to Ten Years - Fair Value | 1,352.3 |
Due after Ten Years - Amortized Cost | 2,075.5 |
Due after Ten Years - Fair Value | 2,243.3 |
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost | 216.1 |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 227.0 |
Other Receivables | 203.9 | 206.1
Other Liabilities | 402.1 | 431.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,244.8 | 343.9
Less Than 12 Months, Unrealized Losses | (71.1) | (7.6)
12 Months or Longer, Fair Value | 79.0 | 54.6
12 Months or Longer, Unrealized Losses | (6.4) | (3.8)
Total, Fair Value | 1,323.8 | 398.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 77.5 | 11.4
Less Than 12 Months, Fair Value | (0.5) | (0.3)
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 | (0.5) | 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 |
Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,391.4 | 4,283.8
Available-for-sale Debt Securities Gross Unrealized Gain | 322.4 | 584.5
Available-for-sale Debt Securities, Gross Unrealized Loss | 68.8 | 8.1
Fixed Maturities at Fair Value | 4,645.0 | 4,860.2
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Other Receivables | 0 | 0
Other Liabilities | 0 | 1.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,043.7 | 315.6
Less Than 12 Months, Unrealized Losses | (63.5) | (5.5)
12 Months or Longer, Fair Value | 69.5 | 40.5
12 Months or Longer, Unrealized Losses | (5.3) | (2.6)
Total, Fair Value | 1,113.2 | 356.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 68.8 | 8.1
Collateralized Loan Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed Maturities at Fair Value | 41.3 |
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 357.2 | 384.0
Available-for-sale Debt Securities Gross Unrealized Gain | 28.4 | 45.1
Available-for-sale Debt Securities, Gross Unrealized Loss | 9.3 | 0.2
Fixed Maturities at Fair Value | 376.3 | 428.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 89.4 | 40.8
Less Than 12 Months, Unrealized Losses | (8.7) | (0.2)
12 Months or Longer, Fair Value | 4.6 | 0
12 Months or Longer, Unrealized Losses | (0.6) | 0
Total, Fair Value | 94.0 | 40.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 9.3 | 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 | 165.1 |
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 | 12.1 |
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 | 0.4 |
Other Non-Governmental Issuers [Member] |  |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 49.4 |
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,334.9 | 1,251.0
Available-for-sale Debt Securities Gross Unrealized Gain | 66.9 | 150.5
Available-for-sale Debt Securities, Gross Unrealized Loss | 17.2 | 0.1
Fixed Maturities at Fair Value | 1,384.6 | 1,401.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 217.0 | 6.3
Less Than 12 Months, Unrealized Losses | (17.2) | (0.1)
12 Months or Longer, Fair Value | 0.3 | 0.3
12 Months or Longer, Unrealized Losses | 0 | 0
Total, Fair Value | 217.3 | 6.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 17.2 | 0.1
Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,643.6 | 2,615.5
Available-for-sale Debt Securities Gross Unrealized Gain | 223.6 | 385.4
Available-for-sale Debt Securities, Gross Unrealized Loss | 41.7 | 7.5
Fixed Maturities at Fair Value | 2,825.5 | 2,993.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 704.4 | 268.5
Less Than 12 Months, Unrealized Losses | (37.0) | (5.2)
12 Months or Longer, Fair Value | 63.0 | 38.1
12 Months or Longer, Unrealized Losses | (4.7) | (2.3)
Total, Fair Value | 767.4 | 306.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 41.7 | 7.5
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 7.1 | 30.1
Available-for-sale Debt Securities Gross Unrealized Gain | 2.1 | 2.5
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 | 0
Fixed Maturities at Fair Value | 9.2 | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments |  | 0
Mortgage and Asset-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 48.6 | 3.2
Available-for-sale Debt Securities Gross Unrealized Gain | 1.4 | 1.0
Available-for-sale Debt Securities, Gross Unrealized Loss | 0.6 | 0.3
Fixed Maturities at Fair Value | 49.4 | 3.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 32.9 | 0
Less Than 12 Months, Unrealized Losses | (0.6) | 0
12 Months or Longer, Fair Value | 1.6 | 1.7
12 Months or Longer, Unrealized Losses | 0 | (0.3)
Total, Fair Value | 34.5 | 1.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0.6 | 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 | 1.1 | 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] |  |
Available for sale Securities, Equity Securities, Cost | 501.7 | 462.7
Available-for-sale Equity Securities, Gross Unrealized Gain | 74.4 | 62.5
Available-for-sale Equity Securities, Gross Unrealized Loss | 8.7 | 3.3
Available for sale Securities, Equity Securities, Fair Value | 567.4 | 521.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 201.1 | 28.3
Less Than 12 Months, Unrealized Losses | (7.6) | (2.1)
12 Months or Longer, Fair Value | 9.5 | 14.1
12 Months or Longer, Unrealized Losses | (1.1) | (1.2)
Total, Fair Value | 210.6 | 42.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 8.7 | 3.3
Preferred Stock Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 85.4 | 75.4
Available-for-sale Equity Securities, Gross Unrealized Gain | 2.8 | 3.9
Available-for-sale Equity Securities, Gross Unrealized Loss | 2.4 | 0.1
Available for sale Securities, Equity Securities, Fair Value | 85.8 | 79.2
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 22.7 | 0
Less Than 12 Months, Unrealized Losses | (2.3) | 0
12 Months or Longer, Fair Value | 2.4 | 2.4
12 Months or Longer, Unrealized Losses | (0.1) | (0.1)
Total, Fair Value | 25.1 | 2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 2.4 | 0.1
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 13.4 | 18.4
Available-for-sale Equity Securities, Gross Unrealized Gain | 4.6 | 3.8
Available-for-sale Equity Securities, Gross Unrealized Loss | 0 | 0.9
Available for sale Securities, Equity Securities, Fair Value | 18.0 | 21.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0 | 2.3
Less Than 12 Months, Unrealized Losses | 0 | (0.8)
12 Months or Longer, Fair Value | 0.7 | 3.7
12 Months or Longer, Unrealized Losses | 0 | (0.1)
Total, Fair Value | 0.7 | 6.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 | 0.9
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 68.1 | 67.0
Available-for-sale Equity Securities, Gross Unrealized Gain | 29.2 | 20.9
Available-for-sale Equity Securities, Gross Unrealized Loss | 0.2 | 0.4
Available for sale Securities, Equity Securities, Fair Value | 97.1 | 87.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 0.4 | 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 | 0.6 | 6.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0.2 | 0.4
Common Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 60.3 | 59.1
Available-for-sale Equity Securities, Gross Unrealized Gain | 17.1 | 8.1
Available-for-sale Equity Securities, Gross Unrealized Loss | 0.9 | 0.5
Available for sale Securities, Equity Securities, Fair Value | 76.5 | 66.7
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 11.7 | 14.2
Less Than 12 Months, Unrealized Losses | (0.8) | (0.4)
12 Months or Longer, Fair Value | 0.5 | 1.3
12 Months or Longer, Unrealized Losses | (0.1) | (0.1)
Total, Fair Value | 12.2 | 15.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0.9 | 0.5
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 137.1 | 119.6
Available-for-sale Equity Securities, Gross Unrealized Gain | 0.8 | 6.3
Available-for-sale Equity Securities, Gross Unrealized Loss | 1.9 | 0
Available for sale Securities, Equity Securities, Fair Value | 136.0 | 125.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 106.8 |
Less Than 12 Months, Unrealized Losses | (1.9) |
12 Months or Longer, Fair Value | 0 |
12 Months or Longer, Unrealized Losses | 0 |
Total, Fair Value | 106.8 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 1.9 |
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale Securities, Equity Securities, Cost | 137.4 | 123.2
Available-for-sale Equity Securities, Gross Unrealized Gain | 19.9 | 19.5
Available-for-sale Equity Securities, Gross Unrealized Loss | 3.3 | 1.4
Available for sale Securities, Equity Securities, Fair Value | 154.0 | 141.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 59.5 | 5.5
Less Than 12 Months, Unrealized Losses | (2.4) | (0.5)
12 Months or Longer, Fair Value | 5.7 | 6.7
12 Months or Longer, Unrealized Losses | (0.9) | (0.9)
Total, Fair Value | 65.2 | 12.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 3.3 | 1.4
External Credit Rating, Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 63.1 | 3.8
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 5.7 | 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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