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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Income Tax Contingency [Line Items]            
Accrued liabilities for interest and penalties   $ 0.3 $ 0.2      
Total gross unrecognized tax benefits   10.4 5.0 $ 3.9   $ 3.9
Estimated increase (decrease) in the liability for unrecognized tax benefits   (0.3)        
Tax benefit from impact of tax law changes enacted $ (1.0) 0.5 0.3 2.5    
Tax benefit from stock-based compensation   $ 20.8 $ 10.3 $ 14.3    
U.S. federal corporate tax rate   21.00% 21.00% 21.00% 35.00%  
Transition toll tax       $ (7.5) $ 27.9 $ 20.4
Measurement period adjustment, Tax Cuts and Jobs Act of 2017       $ 4.0    
Net impact to the 2018 effective tax rate, Tax Cuts and Jobs Act of 2017       0.0145    
Operating loss carryforwards, state and local   $ 14.0        
Operating loss carryforwards, foreign   7.4        
Undistributed earnings of foreign subsidiaries   345.6        
State and Local Jurisdiction            
Income Tax Contingency [Line Items]            
Operating loss carryforwards   204.1        
Foreign Tax Authority            
Income Tax Contingency [Line Items]            
Operating loss carryforwards   56.7        
Operating loss carryforwards, not subject to expiration   54.1        
Year 2021 | State and Local Jurisdiction            
Income Tax Contingency [Line Items]            
Operating loss carryforwards   25.7        
Year After 2021 | State and Local Jurisdiction            
Income Tax Contingency [Line Items]            
Operating loss carryforwards   178.4        
Research Tax Credit Carryforward | State and Local Jurisdiction            
Income Tax Contingency [Line Items]            
Tax credit carryforward   $ 0.9