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Stockholders' Equity - eXponential Stock Performance Plan (Details)
$ in Millions
3 Months Ended
Feb. 12, 2019
tranche
May 24, 2018
USD ($)
shares
Mar. 31, 2020
USD ($)
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     $ 44.3
Number of options expected to vest | shares     4,800,000
Weighted average period over which costs are recognized     5 years 9 months 14 days
eXponential Stock Units (XSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units, granted (in shares) | shares     43,000
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     $ 147.3
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 54.4
2019 eXponential Stock Performance Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period over which costs are recognized     5 years 7 months 24 days
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     43,000
Number of vesting tranches | tranche 12    
First tranche     $ 2,500.0
Tranche incremental increase     1,000.0
Recorded share-based compensation expense     $ 23.2
Number of options expected to vest | shares     4,100,000
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     $ 131.8
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 35.5