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Equity Method Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Method Investments      
Net gain (loss) from equity method investments $ 1.5 $ 2.0  
Net gain (loss) from equity method investments     $ 0.6
Other non-current assets      
Equity Method Investments      
Equity method investments $ 8.8 $ 7.8  
Long Tail Alpha      
Equity Method Investments      
Percentage owned 20.00% 20.00%