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Debt and Other Financing Arrangements - Schedule of Debt (Parenthetical) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 07, 2021
Dec. 31, 2020
[1]
Debt Instrument [Line Items]      
Net unamortized premium $ 0.0   $ 1.1
Merger Agreement [Member]      
Debt Instrument [Line Items]      
Unamortized note issuance costs adjustment   $ 9.3  
Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.25%    
Senior Notes due 2023 [Member] | Merger Agreement [Member]      
Debt Instrument [Line Items]      
Unamortized fair value adjustments related to merger $ 2.0    
Senior Notes due 2024 [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.00%    
Senior Notes due 2024 [Member] | Merger Agreement [Member]      
Debt Instrument [Line Items]      
Unamortized fair value adjustments related to merger $ 12.2    
Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 8.00%    
Senior Notes due 2025 [Member] | Merger Agreement [Member]      
Debt Instrument [Line Items]      
Unamortized fair value adjustments related to merger $ 15.5    
Various Cincinnati Bell Telephone Notes [Member] | Merger Agreement [Member]      
Debt Instrument [Line Items]      
Unamortized fair value adjustments related to merger $ 9.9    
[1] Net unamortized premium was determined to not meet the definition of an asset as of the Merger Date and was therefore not recognized by the Company in the Successor period.