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Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2014
Stockholders Equity Transaction [Line Items]        
Remaining number of shares available for repurchase 2,100,000      
Repurchase of common stock for employee tax withholdings, shares 138,000 130,000 254,000  
Repurchase of common stock for tax withholdings, value   $ 6.3 $ 11.9  
Cash dividends declared per common share $ 1.06 $ 1.00 $ 0.94  
Cash dividend $ 33.7 $ 32.7 $ 30.9  
Stock warrants term       10 years
Stock warrants, exercise price       $ 26.68
Conversion Of Comcast Current Residential Customer Accounts        
Stockholders Equity Transaction [Line Items]        
Issuance of stock warrants       1,900,000
Comcast        
Stockholders Equity Transaction [Line Items]        
Issuance of stock warrants       2,900,000
Stock warrants issued 1,000,000.0      
Stock warrants vested 0      
Beneficial ownership required for potential cash settlement   19.99%    
SEC Rule 10b5-1 Plan        
Stockholders Equity Transaction [Line Items]        
Repurchase of common stock, shares 1,497,000 733,000 624,000  
Total amount paid $ 87.9 $ 36.0 $ 26.3  
Weighted-average price per share $ 58.71 $ 49.13 $ 42.13  
Repurchase of common stock for tax withholdings, value $ 8.7