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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]                
Foreign tax credits $ 8.2   $ 0.0     $ 8.2 $ 0.0  
Valuation allowance for deferred tax assets 35.6   16.9     35.6 16.9  
Amount of temporary difference due to repatriation of earnings from sale or liquidation of subsidiary 317.1         317.1    
Unrecognized tax benefits that, if recognized, would affect effective tax rate 63.5   65.4     63.5 65.4 $ 33.1
Accrued deferred tax assets for indirect tax benefits associated with uncertain tax positions 26.3   27.4     26.3 27.4  
Interest and penalties related to unrecognized tax benefits           0.8 8.4 0.4
Accrued income tax interest and related charges $ 11.4   $ 10.5     11.4 10.5  
Equity Method Investee                
Operating Loss Carryforwards [Line Items]                
Fair value assumptions, discount rate for performance based fees     20.00% 20.00% 20.00%      
Income Tax Valuation Allowance                
Operating Loss Carryforwards [Line Items]                
Increase (decrease) in valuation allowance for deferred tax assets           $ 18.7 $ (7.2)  
Minimum                
Operating Loss Carryforwards [Line Items]                
State net operating loss carryforwards, expiration period           10 years    
Foreign operating loss carryforwards, expiration period           11 years    
Foreign tax credits, expiration period           8 years    
Minimum | Equity Method Investee                
Operating Loss Carryforwards [Line Items]                
Fair value assumptions, discount rate for performance based fees 20.00% 20.00%            
Maximum                
Operating Loss Carryforwards [Line Items]                
State net operating loss carryforwards, expiration period           15 years    
Foreign operating loss carryforwards, expiration period           19 years    
Foreign tax credits, expiration period           10 years    
Non-US                
Operating Loss Carryforwards [Line Items]                
Expense recorded to reduce the carrying value of equity method affiliate               $ 240.0
State                
Operating Loss Carryforwards [Line Items]                
Operating loss carryforwards $ 243.7         $ 243.7    
State | Operating Loss Carryforward                
Operating Loss Carryforwards [Line Items]                
Valuation allowance for deferred tax assets 14.1         14.1    
Foreign                
Operating Loss Carryforwards [Line Items]                
Operating loss carryforwards 74.2         74.2    
Foreign operating loss carryforward indefinitely 9.6         9.6    
Foreign | Operating Loss Carryforward                
Operating Loss Carryforwards [Line Items]                
Valuation allowance for deferred tax assets 13.3         13.3    
Foreign | Foreign Tax Credit Carryforward                
Operating Loss Carryforwards [Line Items]                
Valuation allowance for deferred tax assets 8.2         8.2    
Foreign | Expire over a 20-year period                
Operating Loss Carryforwards [Line Items]                
Operating loss carryforwards $ 64.6         $ 64.6