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Investments - Narrative (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Fair Value Disclosures [Abstract] |  |  |
Securities valued based on dealer quotes or other quoted market prices for similar securities | $ 463,100,000 | $ 483,200,000 |
Percent of securities valued based on dealer quotes or other quoted market prices for similar securities | 25.70% | 33.10% |
Securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities | 37,900,000 | 41,000,000 |
Percent of securities sold, not yet purchased, valued based on dealer quotes or other quoted market prices for similar securities | 80.70% | 73.10% |
Private common equity securities | 3,100,000 | 3,300,000 |
Securities fair valued by using information obtained from the Company's Investment Manager representing less than 1% of total investments in securities and commodities | 1.00% | 1.00% |
Asset transfers from level 1 to level 2 | 0 |  | 0
Asset transfers from level 2 to level 1 | 86.6 |  | 0
Liability transfers from level 1 to level 2 | 0 |  | 0
Liability transfers from level 2 to level 1 | 0 |  | 0
Total unrealized gain (loss) related to fair value assets using significant unobservable inputs (Level 3 | $ 600,000 |  | $ 400,000

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