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Fair Value Measurements - Nature of Investments and Related Liquidity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
NAV of investments at fair value    
Life of funds (in years) 15 years  
Private equity    
NAV of investments at fair value    
Unfunded Commitments [1] $ 131.0 $ 98.8
Other funds    
NAV of investments at fair value    
Unfunded Commitments [2] 0.0 0.0
Other investments    
NAV of investments at fair value    
Unfunded Commitments [3] 131.0 98.8
Other investments | Controlling interests    
NAV of investments at fair value    
Alternative Investment 123.2 80.1
Fair Value Measured at Net Asset Value Per Share [Member] | Private equity    
NAV of investments at fair value    
Alternative Investment [1] 193.2 156.1
Fair Value Measured at Net Asset Value Per Share [Member] | Other funds    
NAV of investments at fair value    
Alternative Investment [2] 7.9 8.9
Fair Value Measured at Net Asset Value Per Share [Member] | Other investments    
NAV of investments at fair value    
Alternative Investment [3] $ 201.1 $ 165.0
[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.
[3] Fair value attributable to the controlling interest was $80.1 million and $123.2 million as of December 31, 2017 and 2018, respectively.