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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Tax Credit Carryforward [Line Items]    
Current income taxes receivable $ 83.1 $ 39.3
Current taxes payable 37.9 11.5
Deferred tax asset, state and local operating loss carryforward 0.4  
Unrecognized tax benefits that would impact effective tax rate 8.6  
ITG    
Tax Credit Carryforward [Line Items]    
Deferred tax asset, non-U.S. operating loss carryforward 15.2 17.9
Valuation allowance on deferred taxes 15.1 15.6
Operating loss carryforwards 75.1 86.3
KCG    
Tax Credit Carryforward [Line Items]    
Deferred tax asset, non-U.S. operating loss carryforward 44.9 44.9
Operating loss carryforwards $ 239.0 $ 239.0