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Fair Value Disclosures - Nonrecurring Fair Value Measurements (Details)
$ in Millions
2 Months Ended 3 Months Ended 11 Months Ended
Nov. 30, 2018
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Sep. 30, 2018
USD ($)
Nov. 30, 2018
USD ($)
Nov. 30, 2020
ft²
Sites
Taxlot
HomeFed            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investment impairment   $ 12.2        
RedSky JZ Fulton Mall | HomeFed            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of separate tax lots | Taxlot           14
Number of premier development sites | Sites           2
Area of real estate property (up to) | ft²           540,000
Equity method investment impairment     $ 55.6      
RedSky JZ Fulton Mall | HomeFed | Development site            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Method Investment, ownership percentage           49.00%
JETX Energy            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of oil and gas properties     33.0      
JETX Energy | Oil and gas properties            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other assets, fair value disclosure     $ 9.6      
Investment in FXCM            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity Method Investment, ownership percentage           50.00%
Equity method investment impairment $ 62.1       $ 62.1  
Investment in FXCM | Nonrecurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investments, fair value $ 75.0       75.0  
Vitesse Energy Finance            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of oil and gas properties   13.2        
Vitesse Energy Finance | Oil and gas properties            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Other assets, fair value disclosure   $ 26.8        
Investment In Golden Queen            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investment impairment       $ 47.9 $ 47.9  
Investment In Golden Queen | Nonrecurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investments, fair value       $ 62.3    
Measurement input, discount rate | JETX Energy | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Servicing asset, measurement input     0.100      
Measurement input, discount rate | Investment in FXCM | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investment, measurement input 0.185       0.185  
Measurement input, discount rate | Vitesse Energy Finance | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Servicing asset, measurement input   0.100        
Measurement input, discount rate | Investment In Golden Queen | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity method investment, measurement input       0.12