Quarterly report pursuant to Section 13 or 15(d)

Debt (Margin Loan) (Details)

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Debt (Margin Loan) (Details) - Broadband Holdco, LLC - Margin Loan Facility - USD ($)
$ in Millions
6 Months Ended
Dec. 27, 2019
Dec. 29, 2017
Jun. 30, 2020
Nov. 25, 2019
Line of Credit Facility [Line Items]        
Line of credit availability (up to)   $ 1,000.0    
Line of credit, outstanding balance     $ 1,300.0  
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit availability (up to)       $ 200.0
Proceeds from lines of credit $ 100.0      
Delayed Draw Term Loan Facility        
Line of Credit Facility [Line Items]        
Line of credit availability (up to)       $ 300.0
Proceeds from lines of credit $ 300.0      
LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate (as a percent)   1.85%    
Series C Common Stock        
Line of Credit Facility [Line Items]        
Number of shares pledged as collateral (in shares)     42,681,842  
Amount of collateral pledged     $ 5,300.0