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Stockholders' Equity - eXponential Stock Performance Plan (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 12, 2019
USD ($)
tranche
item
May 24, 2018
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
First tranche   $ 2,500.0    
Tranche incremental increase   $ 1,000.0    
Recorded share-based compensation expense       $ 60.5
Number of options expected to vest | shares     5,800,000 5,800,000
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares authorized (in shares) | shares   6,365,856    
Unrecognized share-based compensation cost related to unvested stock option awards, probable of achievement     $ 167.9 $ 167.9
Weighted average period over which costs are recognized       5 years 3 months 21 days
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 17.6 $ 17.6
2019 eXponential Stock Performance Plan | eXponential Stock Units (XSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock, expiration period 9 years      
Performance shares authorized (in shares) | shares     100,000 200,000
Number of vesting tranches | tranche 12      
First tranche $ 2,500.0      
Number of performance goals, revenue | item 8      
Number of performance goals, adjusted EBITDA | item 8      
Tranche incremental increase $ 1,000.0      
Anti-dilution provision, maximum shares growth rate per year       3.00%
Recorded share-based compensation expense       $ 33.8
Number of options expected to vest | shares     5,000,000.0 5,000,000.0
2019 eXponential Stock Performance Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized share-based compensation cost related to unvested stock option awards, probable of achievement     $ 148.1 $ 148.1
Weighted average period over which costs are recognized       5 years 1 month 13 days
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 11.4 $ 11.4