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Stock-Based and Deferred Compensation Plans - Narrative (Details) - USD ($)
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 07, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash-Settled Awards Arrangement          
Cash-settled awards, vesting percentage     20.00%    
Cash-settled awards, vesting expiration period     8 years    
Cash-settled awards, granted value         $ 0
Cash-settled awards, vesting period 6 months   4 years    
Remaining cash settled awards vesting period 18 months        
Compensation expense $ 0 $ 4,300,000   $ 5,600,000 7,400,000
Expense incurred for cash-payment awards 1,000,000.0 2,400,000   3,200,000  
Cash-settled awards, remaining unrecognized compensation expense 3,600,000   $ 3,600,000    
Officers and Key Employees [Member]          
Cash-Settled Awards Arrangement          
Cash-settled awards, granted value       10,500,000  
Compensation expense 0 0      
Other Noncurrent Liabilities [Member]          
Cash-Settled Awards Arrangement          
Cash Settled Awards 3,800,000   $ 3,800,000    
Stock Options and Stock Appreciation Rights [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years    
Cash-Settled Awards Arrangement          
Compensation expense 0 0   0 0
Performance Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Performance-Based Restricted Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years    
Expense related to performance-based restricted awards   5,000,000.0      
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expense related to performance-based restricted awards   4,300,000      
Cash-Settled Awards Arrangement          
Compensation expense $ 0 $ 6,900,000   $ 3,200,000 $ 4,700,000
Restricted Stock [Member] | Hawaiian Telcom Holdco, Inc. [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years