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Fair Value Measurements - Quantitative Information About Level 3 (Details) - Level 3 - Affiliate equity repurchase obligations - Discounted cash flow
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Fair Value $ 22.0 $ 19.8
Growth rates | Minimum    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input (0.05) (0.09)
Growth rates | Maximum    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input 0.08 0.07
Growth rates | Weighted Average    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input 0.03 0.05
Discount rates | Minimum    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input 0.14 0.14
Discount rates | Maximum    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input 0.16 0.17
Discount rates | Weighted Average    
Quantitative information for Level 3 Fair Value Measurements Liabilities    
Obligations to related parties, measurement input 0.15 15