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Fair Value Measurements - Summary of Investments in Certain Entities that Calculate Net Asset Value (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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NAV of investments at fair value |  |  |  |
Fair Value | $ 227.5 |  | $ 214.1 |
Unfunded Commitments | 70.9 |  | 62.9 |
Private Equity Fund-Of-Funds |  |  |  |
NAV of investments at fair value |  |  |  |
Fair Value | 139.5 | [1] | 131.8 | [1]
Unfunded Commitments | 70.9 | [1] | 62.9 | [1]
Other Funds |  |  |  |
NAV of investments at fair value |  |  |  |
Fair Value | 88.0 | [2] | 82.3 | [2]
Unfunded Commitments | $ 0 | [2] | $ 0 | [2]
[1] | These funds primarily invest in a broad range of private equity funds, as well as making direct investments. Distributions will be received as the underlying assets are liquidated over the life of the funds.
[2] | These are multi-disciplinary funds that invest across various asset classes and strategies, including long/short equity, credit and real estate. Investments are generally redeemable on a daily or quarterly basis.

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- Definition Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL6742756-110258 + Details
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