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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, 2017
Dec. 31, 2016
NAV of investments at fair value    
Fair Value $ 184.9 $ 174.6
Unfunded Commitments $ 97.1 92.2
Life of funds (in years) 15 years  
Other Investments    
NAV of investments at fair value    
Fair Value $ 148.8 147.5
Unfunded Commitments 97.1 92.2
Private Equity Funds    
NAV of investments at fair value    
Fair Value [1] 141.9 137.8
Unfunded Commitments [1] 97.1 92.2
Other Funds    
NAV of investments at fair value    
Fair Value [2] 6.9 9.7
Unfunded Commitments [2] 0.0 0.0
Marketable Securities    
NAV of investments at fair value    
Fair Value 36.1 27.1
Unfunded Commitments $ 0.0 $ 0.0
[1] To determine the fair value, the Company uses NAV as a practical expedient one quarter in arrears (adjusted for current period calls and distributions). 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] To determine the fair value, the Company uses NAV as a practical expedient. 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.