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Stock-based Compensation - Performance-based RSUs (Details)
shares in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
shares
1st Tranche  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted-average fair value per option granted (in dollars per share) $ 20.64
2nd Tranche  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted-average fair value per option granted (in dollars per share) $ 20.69
PSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) | shares 0.3
Performance goal threshold 100.00%
Maximum performance achieved, percentage of targeted shares earned 200.00%
Percentage adjustment of shares earned, total shareholder return in bottom quartile (10.00%)
Percentage adjustment of shares earned, total shareholder return in top quartile 10.00%
PSUs | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
EBITDA, goal period 2 years
PSUs | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
EBITDA, goal period 3 years
PSUs | 1st Tranche  
Assumptions:  
Expected term 2 years
Expected volatility 89.50%
Risk-free interest rate 0.12%
Dividend yield 0.00%
PSUs | 2nd Tranche  
Assumptions:  
Expected term 3 years
Expected volatility 77.70%
Risk-free interest rate 0.25%
Dividend yield 0.00%