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Investments - Aging of Unrealized Losses on Investments in Fixed Maturities and Equity Securities (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2012 issuer | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Other Receivables | $ 206,100,000 | $ 193,100,000
Less than Twelve Months, Fair Value | 343,900,000 | 1,199,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (7,600,000) | (76,000,000)
Twelve Months or Longer, Fair Value | 54,600,000 | 119,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (3,800,000) | (9,900,000)
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | (300,000) | 0
Available For Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0 | (300,000)
Fair Value | 398,500,000 | 1,318,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (11,400,000) | (85,900,000)
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 |
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 40,800,000 | 95,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (200,000) | (10,900,000)
Twelve Months or Longer, Fair Value | 0 | 4,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | 0 | (800,000)
Fair Value | 40,800,000 | 100,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (200,000) | (11,700,000)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 6,300,000 | 222,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (100,000) | (20,100,000)
Twelve Months or Longer, Fair Value | 300,000 | 2,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | 0 | (100,000)
Fair Value | 6,600,000 | 224,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (100,000) | (20,200,000)
Corporate Bonds and Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 268,500,000 | 699,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (5,200,000) | (39,400,000)
Twelve Months or Longer, Fair Value | 38,100,000 | 103,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (2,300,000) | (8,300,000)
Fair Value | 306,600,000 | 803,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (7,500,000) | (47,700,000)
Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other Receivables | 0 | 2,500,000
Less than Twelve Months, Fair Value | 315,600,000 | 1,032,400,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (5,500,000) | (70,500,000)
Twelve Months or Longer, Fair Value | 40,500,000 | 110,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (2,600,000) | (9,200,000)
Fair Value | 356,100,000 | 1,143,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (8,100,000) | (79,700,000)
Redeemable Preferred Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | 0 |
Twelve Months or Longer, Fair Value | 400,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | 0 |
Fair Value | 400,000 |
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] |  |
Less than Twelve Months, Fair Value | 0 | 13,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | 0 | (100,000)
Twelve Months or Longer, Fair Value | 1,700,000 | 1,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (300,000) | 0
Fair Value | 1,700,000 | 15,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (300,000) | (100,000)
Preferred Stocks Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 22,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | 0 | (2,500,000)
Twelve Months or Longer, Fair Value | 2,400,000 | 2,500,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (100,000) | 0
Fair Value | 2,400,000 | 25,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (100,000) | (2,500,000)
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 2,300,000 | 4,300,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (800,000) | (100,000)
Twelve Months or Longer, Fair Value | 3,700,000 | 700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (100,000) | 0
Fair Value | 6,000,000 | 5,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (900,000) | (100,000)
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 6,300,000 | 5,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (400,000) | (100,000)
Twelve Months or Longer, Fair Value | 0 | 200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | 0 | 0
Fair Value | 6,300,000 | 5,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (400,000) | (100,000)
Common Stock Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 14,200,000 | 14,200,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (400,000) | (900,000)
Twelve Months or Longer, Fair Value | 1,300,000 | 500,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (100,000) | 0
Fair Value | 15,500,000 | 14,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (500,000) | (900,000)
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value |  | 67,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments |  | (1,000,000)
Twelve Months or Longer, Fair Value |  | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments |  | 0
Fair Value |  | 67,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments |  | (1,000,000)
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 5,500,000 | 53,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (500,000) | (900,000)
Twelve Months or Longer, Fair Value | 6,700,000 | 5,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (900,000) | (700,000)
Fair Value | 12,200,000 | 58,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (1,400,000) | (1,600,000)
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than Twelve Months, Fair Value | 28,300,000 | 166,700,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments | (2,100,000) | (5,500,000)
Twelve Months or Longer, Fair Value | 14,100,000 | 8,900,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments | (1,200,000) | (700,000)
Fair Value | 42,400,000 | 175,600,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (3,300,000) | (6,200,000)
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (3,800,000) | (74,200,000)
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated in Investments | (4,300,000) | (5,500,000)
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment | $ (100,000) |
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 |
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average | 3.00% | 5.00%

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