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Shareholders' Equity (Narrative and Dividends) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
stock_class
vote
$ / shares
shares
Jun. 30, 2020
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
$ / shares
Sep. 30, 2020
USD ($)
stock_class
vote
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
$ / shares
shares
Jul. 30, 2018
USD ($)
Shareholders' Equity [Line Items]                
Number of classes of common stock | stock_class 3       3      
Preferred stock, authorized shares 500,000       500,000   500,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01       $ 0.01   $ 0.01  
Preferred stock, issued shares 0       0   0  
Employee stock ownership plan contribution expense | $ $ 0   $ 0   $ 0 $ 0    
Cash dividend declared (USD per share) | $ / shares $ 0.15 $ 0.15 $ 0.30 $ 0.30        
Common Class A                
Shareholders' Equity [Line Items]                
Number of votes | vote 1       1      
Common stock, authorized shares 105,000,000.0       105,000,000.0   105,000,000.0  
Share repurchase program, authorized amount | $               $ 100,000,000.0
Shares repurchased (in shares) 0   0   0 0    
Remaining authorized repurchases | $ $ 100,000,000.0       $ 100,000,000.0      
Common Class B                
Shareholders' Equity [Line Items]                
Number of votes | vote 10       10      
Common stock, authorized shares 80,000,000.0       80,000,000.0   80,000,000.0  
Common Class C                
Shareholders' Equity [Line Items]                
Number of votes | vote 10       10      
Common stock, authorized shares 20,000,000.0       20,000,000.0   20,000,000.0