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Discontinued Operations - Narrative (Details) - USD ($)
3 Months Ended
Aug. 26, 2020
Mar. 31, 2021
Feb. 01, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Current liabilities   $ 1,202,317,000   $ 1,208,061,000
Wireless Segment        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Accounts receivable   49,400,000   51,700,000
Current liabilities   4,900,000   $ 6,100,000
Discontinued Operations, Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale proceeds     $ 1,950,000,000  
Minimum        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Accelerated expenses   0    
Maximum        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Accelerated expenses   $ 36,000,000    
Affiliated Entity        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Value of business percentage 90.00%