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Fair Value Measurements - Nature of Investments and Related Liquidity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
NAV of investments at fair value    
Life of funds (in years) 15 years  
Private equity    
NAV of investments at fair value    
Fair Value [1] $ 156.1 $ 137.8
Unfunded Commitments [1] 98.8 92.2
Other funds    
NAV of investments at fair value    
Fair Value [2] 8.9 9.7
Unfunded Commitments [2] 0.0 0.0
Other investments    
NAV of investments at fair value    
Fair Value [3] 165.0 147.5
Unfunded Commitments [3] 98.8 92.2
Other investments | Parent    
NAV of investments at fair value    
Fair Value $ 80.1 $ 59.9
[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, 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.
[3] Fair value attributable to the controlling interest was $59.9 million and $80.1 million as of December 31, 2016 and 2017, respectively.