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Earnings Per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Underwater Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Equivalent shares excluded from weighted average shares outstanding (in shares) 2,000,000 9,000,000 2,000,000 9,000,000
In-the-money Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Equivalent shares excluded from weighted average shares outstanding (in shares)       0