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Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2014
Stockholders Equity Transaction [Line Items]        
Remaining number of shares available for repurchase 3,600,000      
Repurchase of common stock for employee tax withholdings, shares 130,000 254,000 117,000  
Repurchase of common stock for tax withholdings, value $ 6.3 $ 11.9 $ 5.1  
Cash dividends declared per common share $ 1.00 $ 0.94 $ 0.89  
Cash dividend $ 32.7 $ 30.9 $ 29.4  
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 exercised     400,000  
Fair value of stock warrants $ 24.6      
Weighted average price per share $ 56.12      
Net cash settlement for provision of warrant agreement $ 12.9      
Adjustment to additional paid-in capital, warrant issued $ 9.1      
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 733,000 624,000 576,000  
Total amount paid $ 36.0 $ 26.3 $ 25.5  
Weighted-average price per share $ 49.13 $ 42.13 $ 44.17