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Fair Value Measurements - Investments Measured at Net Asset Value as Practical Expedient (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
NAV of investments at fair value    
Life of funds (in years) 15 years  
Other Investments    
NAV of investments at fair value    
Fair Value $ 151.8 $ 147.5
Unfunded Commitments 92.1 92.2
Private Equity Funds    
NAV of investments at fair value    
Fair Value [1] 147.3 137.8
Unfunded Commitments [1] 92.1 92.2
Other Funds    
NAV of investments at fair value    
Fair Value [2] 4.5 9.7
Unfunded Commitments [2] $ 0.0 $ 0.0
[1] The Company uses NAV as a practical expedient one quarter in arrears (adjusted for current period calls and distributions)to determine the fair value. 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, which is generally up to 15 years.
[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, monthly or quarterly basis.