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Preferred and Common Stockholders' Equity - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2016
Class of Stock [Line Items]          
Preferred stock authorized (shares) 5,000,000        
Preferred stock, par value (dollars per share) $ 0.01        
Preferred stock outstanding (shares) 0        
Common stock authorized (shares) 150,000,000        
Common stock, par value (dollars per share) $ 0.01        
Common stock issued (shares) 79,700,000 75,200,000 75,400,000 74,500,000  
Common stock outstanding (shares) 79,700,000 75,200,000 75,400,000 74,500,000  
Share repurchase program, remaining repurchase authorization $ 110,700,000        
Shares repurchased 0 0      
Eighth Share Repurchase Program          
Class of Stock [Line Items]          
Share repurchase program, authorized amount         $ 200,000,000