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Investments (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Cost of investments in marketable securities, gross unrealized gains and losses |  |
Total investment | $ 128.9 | $ 100.4
Value Partners Group Limited ("Value Partners") |  |
Cost of investments in marketable securities, gross unrealized gains and losses |  |
Total investment | $ 90.6 |
Outstanding common stock (as a percent) | 7.80% |

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