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Fair Value Measurements - Nature of Investments and Related Liquidity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
NAV of investments at fair value    
Life of funds (in years) 15 years  
Private equity    
NAV of investments at fair value    
Unfunded Commitments [1] $ 127.2 $ 131.0
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] 127.2 131.0
Other investments | Controlling interests    
NAV of investments at fair value    
Alternative Investment 137.6 123.2
Fair Value Measured at NAV | Private equity    
NAV of investments at fair value    
Alternative Investment [1] 203.3 193.2
Fair Value Measured at NAV | Other funds    
NAV of investments at fair value    
Alternative Investment [2] 8.5 7.9
Fair Value Measured at NAV | Other investments    
NAV of investments at fair value    
Alternative Investment [3] $ 211.8 $ 201.1
[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 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.
[2]
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.
[3]
Fair value attributable to the controlling interest was $123.2 million and $137.6 million as of December 31, 2018 and 2019, respectively.