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Fair Value Measurements - Investments Measured at Net Asset Value as Practical Expedient (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
NAV of investments at fair value    
Life of funds (in years) 15 years  
Other Investments    
NAV of investments at fair value    
Unfunded Commitments [1] $ 146.6 $ 131.0
Other Investments | Fair Value Measured at NAV    
NAV of investments at fair value    
Fair Value [1] 207.5 201.1
Other Investments | Controlling Interest    
NAV of investments at fair value    
Fair Value 131.3 123.2
Private equity funds    
NAV of investments at fair value    
Unfunded Commitments [2] 146.6 131.0
Private equity funds | Fair Value Measured at NAV    
NAV of investments at fair value    
Fair Value [2] 198.5 193.2
Other funds    
NAV of investments at fair value    
Unfunded Commitments [3] 0.0 0.0
Other funds | Fair Value Measured at NAV    
NAV of investments at fair value    
Fair Value [3] $ 9.0 $ 7.9
[1] Fair value attributable to the controlling interest was $123.2 million and $131.3 million as of December 31, 2018 and March 31, 2019, respectively.
[2] 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
[3] 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.