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Stockholders' Equity, Stock Repurchase Program, Dividends and Shelf Registration (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 02, 2021
Mar. 11, 2020
Nov. 04, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 04, 2020
Mar. 18, 2020
Apr. 23, 2018
Dividends [Abstract]                            
Dividends declared (in dollars per share)       $ 0.02 $ 2.02 $ 0.02 $ 0.02 $ 0.02 $ 0.02          
Shelf Registration [Abstract]                            
Maximum amount of debt and equity to be issued under shelf registration                           $ 500
Subsequent Event [Member]                            
Stock Repurchase Program [Abstract]                            
Average price per share of repurchased shares (in dollars per share)     $ 25.36                      
Dividends [Abstract]                            
Dividends declared (in dollars per share) $ 0.04                          
Subordinated Notes [Member] | Special Dividend [Member]                            
Dividends [Abstract]                            
Dividends declared (in dollars per share)       2.00           $ 2.00        
Class A Stock [Member]                            
Stock Repurchase Program [Abstract]                            
Incremental Class A shares authorized to buyback (in shares)                       3,000,000    
Dividends [Abstract]                            
Dividends declared (in dollars per share)       $ 0.02     $ 0.02     $ 0.06 $ 0.06      
Class A Stock [Member] | Stock Repurchase Program [Member]                            
Stock Repurchase Program [Abstract]                            
Stock repurchase authorized, amount                         $ 30  
Shares repurchased (in shares)       92,427     133,383     347,389 254,180      
Average price per share of repurchased shares (in dollars per share)       $ 26.65     $ 12.26     $ 22.44 $ 13.19      
Share available under program to repurchase (in shares)   2,000,000   2,527,270           2,527,270        
Aggregate purchase price   $ 30                        
Class A Stock [Member] | Stock Repurchase Program [Member] | Minimum [Member]                            
Stock Repurchase Program [Abstract]                            
Average price per share of repurchased shares (in dollars per share)   $ 15.00                        
Class A Stock [Member] | Stock Repurchase Program [Member] | Maximum [Member]                            
Stock Repurchase Program [Abstract]                            
Average price per share of repurchased shares (in dollars per share)   $ 17.00                        
Class B Stock [Member]                            
Dividends [Abstract]                            
Dividends declared (in dollars per share)       $ 0.02     $ 0.02     $ 0.06 $ 0.06