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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, 2020
Dec. 31, 2019
Other Investments    
NAV of investments at fair value    
Unfunded Commitments [1] $ 127.0 $ 127.2
Other Investments | Fair Value Measured at NAV    
NAV of investments at fair value    
Fair Value [1] 222.9 211.8
Other Investments | Controlling Interest    
NAV of investments at fair value    
Fair Value 155.7 137.6
Private equity funds    
NAV of investments at fair value    
Unfunded Commitments [2] 127.0 127.2
Private equity funds | Fair Value Measured at NAV    
NAV of investments at fair value    
Fair Value [2] $ 218.7 203.3
Life of funds 15 years  
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] $ 4.2 $ 8.5
[1]
Fair value attributable to the controlling interest was $137.6 million and $155.7 million as of December 31, 2019 and March 31, 2020, respectively.
[2]
The Company accounts for its interests in private equity funds under the equity method of accounting and, therefore 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 third-party funds and 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 equity, credit and real estate. Investments are generally redeemable on a daily, monthly or quarterly basis.