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Investments in Marketable Securities | 6 Months Ended
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Jun. 30, 2013
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities Investments in marketable securities at December 31, 2012 and June 30, 2013 were $128.9 million and $120.1 million, respectively. These investments are comprised of the Company's investments in Value Partners Group Limited ("Value Partners"), a publicly-traded asset management firm based in Hong Kong, and investments held by Affiliates. The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading at December 31, 2012 and June 30, 2013:
| Available-for-Sale |  | Trading
| December 31, 2012 |  | June 30, 2013 |  | December 31, 2012 |  | June 30, 2013
Cost | $ | 103.2 |  |  | $ | 102.8 |  |  | $ | 10.3 |  |  | $ | 18.1 |
Unrealized Gains | 15.3 |  |  | 4.1 |  |  | 6.5 |  |  | 2.4 |
Unrealized Losses | (3.2 | ) |  | (7.3 | ) |  | (3.2 | ) |  | — |
Fair Value | $ | 115.3 |  |  | $ | 99.6 |  |  | $ | 13.6 |  |  | $ | 20.5 |
During the second quarter of 2013, the Company's investment in Value Partners declined, resulting in an unrealized loss at June 30, 2013. The Company intends to hold this investment for a reasonable period of time sufficient for a forecasted recovery. The following is a summary of the Company's realized gains and losses on investments classified as available-for-sale and trading:
| Available-for-Sale |  | Trading
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30, |  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013
Gains | $ | — |  |  | $ | 1.9 |  |  | $ | — |  |  | $ | 2.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.6 |  |  | $ | 0.4 |
Losses | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.3 | ) |  | — |
Net realized gains | $ | — |  |  | $ | 1.9 |  |  | $ | — |  |  | $ | 2.1 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.4 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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