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Stockholders' Equity Stockholders' Equity - eXponential Stock Performance Plan (Details)
$ in Millions
1 Months Ended 3 Months Ended
May 24, 2018
USD ($)
shares
Jan. 31, 2019
shares
Mar. 31, 2019
USD ($)
tranche
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     $ 4.7
Number of options expected to vest | shares     1,100,000
Weighted average period over which costs are recognized     7 years
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     $ 40.5
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 200.7
2019 eXponential Stock Performance Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period over which costs are recognized     7 years
2019 eXponential Stock Performance Plan | eXponential Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares authorized (in shares) | shares   5,200,000  
Number of vesting tranches | tranche     12
First tranche     $ 2,500.0
Tranche incremental increase     1,000.0
Recorded share-based compensation expense     $ 0.7
Number of options expected to vest | shares     900,000
Post-vest holding period     2 years 6 months
Expected term     9 years
Dividend yield (as a percentage)     0.00%
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     $ 36.8
Unrecognized share-based compensation cost related to unvested stock option awards, not probable of achievement     $ 137.0
2019 eXponential Stock Performance Plan | Minimum | eXponential Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liquidity discount (as a percentage)     10.00%
Risk-free interest rate (as a percentage)     2.47%
Expected volatility (as a percentage)     44.96%
2019 eXponential Stock Performance Plan | Maximum | eXponential Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liquidity discount (as a percentage)     16.80%
Risk-free interest rate (as a percentage)     2.62%
Expected volatility (as a percentage)     45.47%