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Investments - Schedule of Investments (Details) (USD $) | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 4,294,800,000 |  |
Available-for-sale Debt Securities, Fair Value | 4,680,000,000 |  | 4,575,000,000
Available for sale Securities, Equity Securities, Cost | 541,000,000 |  | 530,000,000
Available for sale Securities, Equity Securities, Fair Value | 646,200,000 |  | 598,500,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Due in One Year or Less - Amortized Cost | 48,200,000 |  |
Due in One Year or Less - Fair Value | 49,100,000 |  |
Due after One Year to Five Years - Amortized Cost | 770,500,000 |  |
Due after One Year to Five Years - Fair Value | 824,500,000 |  |
Due after Five Years to Ten Years - Amortized Cost | 1,290,900,000 |  |
Due after Five Years to Ten Years - Fair Value | 1,349,100,000 |  |
Due after Ten Years - Amortized Cost | 1,986,600,000 |  |
Due after Ten Years - Fair Value | 2,246,100,000 |  |
Asset-backed Securities Not Due in a Single Maturity Date - Amortized Cost | 198,600,000 |  |
Asset-backed Securities Not Due in a Single Maturity Date - Fair Value | 211,200,000 |  |
Other Receivables | 190,500,000 |  | 193,100,000
Other Liabilities | 390,100,000 |  | 329,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 251,100,000 |  | 1,199,100,000
Less Than 12 Months, Unrealized Losses | (5,700,000) |  | (76,000,000)
12 Months or Longer, Fair Value | 780,900,000 |  | 119,600,000
12 Months or Longer, Unrealized Losses | (25,800,000) |  | (9,900,000)
Total, Fair Value | 1,032,000,000 |  | 1,318,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (31,500,000) |  | (85,900,000)
Less Than 12 Months, Fair Value | 0 |  | 0
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 | 300,000 |  | 300,000
Purchases of Fair Value Option Investments | 42,900,000 | 0 |
Sales of Fair Value Option Investments | 2,900,000 | 0 |
Fair Value Option Investments | 40,300,000 |  | 0
Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,294,800,000 |  | 4,370,500,000
Available-for-sale Debt Securities Gross Unrealized Gain | 412,600,000 |  | 284,200,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (27,400,000) |  | (79,700,000)
Available-for-sale Debt Securities, Fair Value | 4,680,000,000 |  | 4,575,000,000
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Other Receivables | 0 |  | 2,500,000
Other Liabilities | 46,300,000 |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 172,300,000 |  | 1,032,400,000
Less Than 12 Months, Unrealized Losses | (2,900,000) |  | (70,500,000)
12 Months or Longer, Fair Value | 750,000,000 |  | 110,700,000
12 Months or Longer, Unrealized Losses | (24,500,000) |  | (9,200,000)
Total, Fair Value | 922,300,000 |  | 1,143,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (27,400,000) |  | (79,700,000)
US Government and Government Agencies and Authorities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 332,400,000 |  | 351,100,000
Available-for-sale Debt Securities Gross Unrealized Gain | 28,900,000 |  | 22,800,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (6,000,000) |  | (11,700,000)
Available-for-sale Debt Securities, Fair Value | 355,300,000 |  | 362,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 24,100,000 |  | 95,800,000
Less Than 12 Months, Unrealized Losses | (1,500,000) |  | (10,900,000)
12 Months or Longer, Fair Value | 65,400,000 |  | 4,400,000
12 Months or Longer, Unrealized Losses | (4,500,000) |  | (800,000)
Total, Fair Value | 89,500,000 |  | 100,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (6,000,000) |  | (11,700,000)
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 | 145,800,000 |  |
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 - Fair Value | 10,100,000 |  |
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 - Fair Value | 300,000 |  |
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 | 55,000,000 |  |
States and Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,295,300,000 |  | 1,327,400,000
Available-for-sale Debt Securities Gross Unrealized Gain | 99,800,000 |  | 53,800,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (5,900,000) |  | (20,200,000)
Available-for-sale Debt Securities, Fair Value | 1,389,200,000 |  | 1,361,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 31,000,000 |  | 222,900,000
Less Than 12 Months, Unrealized Losses | (400,000) |  | (20,100,000)
12 Months or Longer, Fair Value | 181,000,000 |  | 2,000,000
12 Months or Longer, Unrealized Losses | (5,500,000) |  | (100,000)
Total, Fair Value | 212,000,000 |  | 224,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (5,900,000) |  | (20,200,000)
Bonds and Notes [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,607,600,000 |  | 2,636,400,000
Available-for-sale Debt Securities Gross Unrealized Gain | 281,100,000 |  | 205,000,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (15,300,000) |  | (47,700,000)
Available-for-sale Debt Securities, Fair Value | 2,873,400,000 |  | 2,793,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 104,100,000 |  | 699,800,000
Less Than 12 Months, Unrealized Losses | (900,000) |  | (39,400,000)
12 Months or Longer, Fair Value | 500,600,000 |  | 103,200,000
12 Months or Longer, Unrealized Losses | (14,400,000) |  | (8,300,000)
Total, Fair Value | 604,700,000 |  | 803,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (15,300,000) |  | (47,700,000)
Redeemable Preferred Stocks [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 6,400,000 |  | 6,600,000
Available-for-sale Debt Securities Gross Unrealized Gain | 700,000 |  | 800,000
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 |  | 0
Available-for-sale Debt Securities, Fair Value | 7,100,000 |  | 7,400,000
Collateralized Loan Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 49,100,000 |  | 44,200,000
Available-for-sale Debt Securities Gross Unrealized Gain | 600,000 |  | 500,000
Available-for-sale Debt Securities, Gross Unrealized Loss | (200,000) |  | 0
Available-for-sale Debt Securities, Fair Value | 49,500,000 |  | 44,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 13,100,000 |  |
Less Than 12 Months, Unrealized Losses | (100,000) |  |
12 Months or Longer, Fair Value | 2,300,000 |  |
12 Months or Longer, Unrealized Losses | (100,000) |  |
Total, Fair Value | 15,400,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (200,000) |  |
Mortgage and Asset-backed [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,000,000 |  | 4,800,000
Available-for-sale Debt Securities Gross Unrealized Gain | 1,500,000 |  | 1,300,000
Available-for-sale Debt Securities, Gross Unrealized Loss | 0 |  | (100,000)
Available-for-sale Debt Securities, Fair Value | 5,500,000 |  | 6,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 0 |  | 13,900,000
Less Than 12 Months, Unrealized Losses | 0 |  | (100,000)
12 Months or Longer, Fair Value | 700,000 |  | 1,100,000
12 Months or Longer, Unrealized Losses | 0 |  | 0
Total, Fair Value | 700,000 |  | 15,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | 0 |  | (100,000)
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 541,000,000 |  | 530,000,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 109,300,000 |  | 74,700,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 4,100,000 |  | 6,200,000
Available for sale Securities, Equity Securities, Fair Value | 646,200,000 |  | 598,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 78,800,000 |  | 166,700,000
Less Than 12 Months, Unrealized Losses | (2,800,000) |  | (5,500,000)
12 Months or Longer, Fair Value | 30,900,000 |  | 8,900,000
12 Months or Longer, Unrealized Losses | (1,300,000) |  | (700,000)
Total, Fair Value | 109,700,000 |  | 175,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (4,100,000) |  | (6,200,000)
Exchange Traded Funds [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 119,000,000 |  | 122,000,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 12,000,000 |  | 3,900,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 100,000 |  | 1,000,000
Available for sale Securities, Equity Securities, Fair Value | 130,900,000 |  | 124,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 0 |  | 67,600,000
Less Than 12 Months, Unrealized Losses | 0 |  | (1,000,000)
12 Months or Longer, Fair Value | 14,900,000 |  | 0
12 Months or Longer, Unrealized Losses | (100,000) |  | 0
Total, Fair Value | 14,900,000 |  | 67,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (100,000) |  | (1,000,000)
Limited Liability Companies and Limited Partnerships [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 160,300,000 |  | 150,300,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 36,300,000 |  | 25,200,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 2,200,000 |  | 1,600,000
Available for sale Securities, Equity Securities, Fair Value | 194,400,000 |  | 173,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 50,400,000 |  | 53,100,000
Less Than 12 Months, Unrealized Losses | (1,800,000) |  | (900,000)
12 Months or Longer, Fair Value | 2,800,000 |  | 5,000,000
12 Months or Longer, Unrealized Losses | (400,000) |  | (700,000)
Total, Fair Value | 53,200,000 |  | 58,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (2,200,000) |  | (1,600,000)
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 | (23,900,000) |  | (74,200,000)
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 | (3,500,000) |  | (5,500,000)
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average | 3.00% |  | 5.00%
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 85,400,000 |  | 85,400,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 5,500,000 |  | 2,900,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 800,000 |  | 2,500,000
Available for sale Securities, Equity Securities, Fair Value | 90,100,000 |  | 85,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 0 |  | 22,500,000
Less Than 12 Months, Unrealized Losses | 0 |  | (2,500,000)
12 Months or Longer, Fair Value | 12,200,000 |  | 2,500,000
12 Months or Longer, Unrealized Losses | (800,000) |  | 0
Total, Fair Value | 12,200,000 |  | 25,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (800,000) |  | (2,500,000)
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 21,100,000 |  | 20,100,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 5,500,000 |  | 4,400,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 100,000 |  | 100,000
Available for sale Securities, Equity Securities, Fair Value | 26,500,000 |  | 24,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 4,300,000 |  | 4,300,000
Less Than 12 Months, Unrealized Losses | (100,000) |  | (100,000)
12 Months or Longer, Fair Value | 700,000 |  | 700,000
12 Months or Longer, Unrealized Losses | 0 |  | 0
Total, Fair Value | 5,000,000 |  | 5,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (100,000) |  | (100,000)
2000 to 3999 Manufacturing [Member] | Common Stocks [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 83,400,000 |  | 83,400,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 26,600,000 |  | 21,300,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 200,000 |  | 100,000
Available for sale Securities, Equity Securities, Fair Value | 109,800,000 |  | 104,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 10,800,000 |  | 5,000,000
Less Than 12 Months, Unrealized Losses | (200,000) |  | (100,000)
12 Months or Longer, Fair Value | 300,000 |  | 200,000
12 Months or Longer, Unrealized Losses | 0 |  | 0
Total, Fair Value | 11,100,000 |  | 5,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (200,000) |  | (100,000)
All Industries Other than Manufacturing [Member] | Common Stocks [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available for sale Securities, Equity Securities, Cost | 71,800,000 |  | 68,800,000
Available-for-sale Equity Securities, Gross Unrealized Gain | 23,400,000 |  | 17,000,000
Available-for-sale Equity Securities, Gross Unrealized Loss | 700,000 |  | 900,000
Available for sale Securities, Equity Securities, Fair Value | 94,500,000 |  | 84,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Less Than 12 Months, Fair Value | 13,300,000 |  | 14,200,000
Less Than 12 Months, Unrealized Losses | (700,000) |  | (900,000)
12 Months or Longer, Fair Value | 0 |  | 500,000
12 Months or Longer, Unrealized Losses | 0 |  | 0
Total, Fair Value | 13,300,000 |  | 14,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | $ (700,000) |  | $ (900,000)

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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