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Stockholders' Equity - Award Modifications (Details) - USD ($)
shares in Millions
3 Months Ended 12 Months Ended
Mar. 30, 2016
Mar. 31, 2018
Dec. 31, 2016
Dec. 31, 2018
2016 Plan Modification        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Plan modification, stock-based compensation $ 18,800,000   $ 8,900,000  
Allocated share-based compensation expense     $ 37,700,000  
Plan modification, remaining unamortized expense       $ 0
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Plan modification, stock-based compensation   $ 10,000,000    
Restricted Stock Units (RSUs) | 2016 Plan Modification        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs received on exchange (in shares)     2.2  
Employee Stock Option | 2016 Plan Modification        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exchanged (in shares)     4.3