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Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2023
Aug. 31, 2023
Jul. 31, 2014
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stockholders Equity Transaction [Line Items]              
Remaining authorized repurchase amount       $ 100.0 $ 100.0    
Accrued excise tax       $ 1.0 $ 1.0    
Repurchase of common stock for employee tax withholdings, shares         182,000 138,000 130,000
Repurchase of common stock for tax withholdings, value         $ 10.2 $ 8.7 $ 6.3
Cash dividends declared per common share         $ 1.12 $ 1.06 $ 1
Cash dividend         $ 34.3 $ 33.7 $ 32.7
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 1,000,000    
Stock warrants vested         0    
Beneficial ownership required for potential cash settlement       19.99% 19.99%    
SEC Rule 10b5-1 Plan              
Stockholders Equity Transaction [Line Items]              
Repurchase of common stock, shares   275,000     2,188,000 1,497,000 733,000
Total amount paid   $ 15.0     $ 117.1 $ 87.9 $ 36.0
Weighted-average price per share   $ 54.65     $ 53.51 $ 58.71 $ 49.13
2023 Convertible Notes              
Stockholders Equity Transaction [Line Items]              
Repurchase of common stock, shares 1,680,000            
Total amount paid $ 90.1            
Weighted-average price per share $ 53.62            
Second SEC Rule 10b5-1 Plan              
Stockholders Equity Transaction [Line Items]              
Remaining authorized repurchase amount $ 100.0            
Repurchase of common stock, shares       233,000      
Total amount paid       $ 12.0      
Weighted-average price per share $ 51.33            
Stock Repurchase Program              
Stockholders Equity Transaction [Line Items]              
Remaining authorized repurchase amount       $ 95.8 $ 95.8