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Fair Value Measurements - Summary of Investments in Certain Entities that Calculate Net Asset Value (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
NAV of investments at fair value    
Fair value $ 180.2 $ 198.3
Unfunded commitments $ 77.2 76.8
Life of funds (in years) 15 years  
Private Equity Funds    
NAV of investments at fair value    
Fair value [1] $ 137.3 126.0
Unfunded commitments [1] 77.2 76.8
Other Funds    
NAV of investments at fair value    
Fair value [2] 42.9 72.3
Unfunded commitments [2] $ 0.0 $ 0.0
[1] These funds primarily invest in a broad range of private equity funds, as well as make 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.