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Stock-Based Compensation - Narrative (Details)
3 Months Ended 12 Months Ended
Apr. 29, 2020
shares
Oct. 07, 2016
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
May 01, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) | $ / shares         $ 6.68 $ 22.35  
Fair value of stock options vested       $ 5,700,000 $ 10,200,000 $ 8,800,000  
Intrinsic value of stock options exercised         $ 0 $ 200,000  
Share-based Payment Arrangement, Plan Modification, Incremental Cost       $ 2,700,000      
Restricted stock awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) | $ / shares       $ 1.12 $ 6.59 $ 18.11  
Fair value of vested restricted stock awards       $ 17,400,000 $ 12,000,000.0 $ 6,600,000  
Unrecognized compensation costs     $ 21,000,000.0 $ 21,000,000.0      
Unrecognized compensation costs, period for recognition       1 year 10 months 24 days      
Granted (in shares) | shares       10,245,500      
Stock option awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation costs, period for recognition       1 year 1 month 6 days      
Intrinsic value of stock options exercised       $ 0      
Unrecognized compensation costs     900,000 $ 900,000      
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in dollars per share) | $ / shares       $ 0      
Unrecognized compensation costs, period for recognition       1 year 2 months 12 days      
Unrecognized compensation costs     2,400,000 $ 2,400,000      
Share-based compensation requisite service period       3 years      
Cash-settled Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation costs     $ 5,500,000 $ 5,500,000      
Unrecognized compensation costs, period for recognition       1 year 9 months 18 days      
Granted (in shares) | shares       5,500,000      
Share-based compensation requisite service period       3 years      
Cash-settled Restricted Stock [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Rights, Percentage Return     4        
Cash-settled Restricted Stock [Member] | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Rights, Percentage Return     0.25        
Cash-settled Performance Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation costs     $ 10,600,000 $ 10,600,000      
Unrecognized compensation costs, period for recognition       2 years 6 months      
Granted (in shares) | shares       5,500,000      
Share-based compensation requisite service period       3 years      
2019 Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance under LTIP (in shares) | shares             2,000,000
Shares available for future grants (in shares) | shares     1,837,381 1,837,381      
2016 Long Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for future grants (in shares) | shares     6,579,226 6,579,226      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares 8,250,000            
2016 Long Term Incentive Plan | Common Class A              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for issuance under LTIP (in shares) | shares   16,500,000          
2016 Long Term Incentive Plan | Stock option awards | Common Class A              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Option expiration period   10 years          
Vesting period   3 years          
Officer | Restricted stock awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation requisite service period       3 years      
Director | Restricted stock awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period       1 year