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Stockholders' Equity - eXponential Stock Performance Plan (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 12, 2019
USD ($)
item
tranche
May 24, 2018
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Market capitalization goal for such tranche   $ 2,500.0    
Market capitalization goal increment   $ 1,000.0    
Recorded share-based compensation expense       $ 204.2
Number of options expected to vest | shares     4,800,000 4,800,000
eXponential Stock Units | 2019 eXponential Stock Performance Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares authorized (in shares) | shares     23,000 23,000
Expiration period 9 years      
Number of vesting tranches of share-based awards | tranche 12      
Market capitalization goal for such tranche $ 2,500.0      
Number of performance goals, revenue | item 8      
Number of performance goals, adjusted EBITDA | item 8      
Market capitalization goal increment $ 1,000.0      
Anti-dilution provision, maximum shares growth rate per year       3.00%
Recorded share-based compensation expense       $ 151.4
Unrecognized stock-based compensation expense     $ 42.3 $ 42.3
Weighted average period over which costs are recognized       2 years 2 months 12 days
eXponential Stock Units | 2019 eXponential Stock Performance Plan | Eleven Operational Goals        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options expected to vest | shares     4,000,000.0 4,000,000.0
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares authorized (in shares) | shares   6,365,856    
Weighted average period over which costs are recognized       1 year 6 months 25 days