Description of Business and Accounting Policies - Narrative (Details)		3 Months Ended		4 Months Ended		8 Months Ended	12 Months Ended
	Sep. 07, 2021 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Sep. 07, 2021 USD ($) $ / shares	Dec. 31, 2023 USD ($) Employee Customer shares	Dec. 31, 2022 USD ($) Customer shares	Dec. 31, 2024 USD ($)	Aug. 31, 2023 USD ($)	Mar. 31, 2023 Facility
Description of Business and Accounting Policies [Line Items]
Entity number of employees | Employee							5,300
Company employees participating in collective bargaining agreement, percentage							23.00%
Trade receivables due from customers, range, minimum							21 days
Trade receivables due from customers, range, maximum							90 days
Unbilled receivables, current							$ 78,800,000	$ 66,900,000
Allowance for uncollectible accounts							17,700,000	12,000,000.0
Fees related to accounts receivable sales							900,000	1,800,000
Accounts receivable sold							3,500,000	56,800,000
Goodwill, impairment loss				$ 0		$ 0	0	0
Impairment losses on Indefinite-lived intangible assets				0		0	0	0
Loss on impairment of long-lived assets			$ 2,700,000	0		0	0	2,700,000
Cost method investments							10,000,000	8,000,000
Impairment losses on cost method investments				$ 0		$ 0	$ 0	$ 0
Revenue derived from foreign operations				6.00%		6.00%	7.00%	7.00%
Service delivery period, indefeasible right of use contracts, upper range, in years							25 years
Customer contract, maintenance on telephony equipment, lower range, in years							1 year
Customer contract, maintenance on telephony equipment, upper range, in years							3 years
Advertising expense				$ 7,100,000		$ 12,800,000	$ 26,700,000	$ 25,100,000
Regulatory taxes included in revenue				13,200,000		27,200,000	34,000,000	32,900,000
Regulatory taxes included in expense				$ 13,700,000		$ 32,100,000	38,000,000	$ 36,900,000
Capital contributions committed by parent										$ 600,000,000
Capital contributions received from parent					$ 1,716,100,000		400,000,000
Number of receivable facility | Facility											2
Forecast
Description of Business and Accounting Policies [Line Items]
Capital contributions committed by parent for next fiscal year									$ 200,000,000
Additional Paid-in Capital [Member]
Description of Business and Accounting Policies [Line Items]
Capital contributions received from parent		$ 400,000,000			$ 1,716,100,000		$ 400,000,000
Hawaiian Telcom 2010 Equity Incentive Plan
Description of Business and Accounting Policies [Line Items]
Number of outstanding awards granted | shares							0	0
Cincinnati Bell Incorporation
Description of Business and Accounting Policies [Line Items]
Business Acquisition, Share Price | $ / shares	$ 15.50					$ 15.50
Cincinnati Bell Incorporation | 2017 Stock Plan for Non-Employee Directors
Description of Business and Accounting Policies [Line Items]
Number of outstanding awards granted | shares							0	0
Cincinnati Bell Incorporation | SG&A [Member]
Description of Business and Accounting Policies [Line Items]
Incremental stock-based compensation expense	$ 9,300,000					$ 9,300,000
Cincinnati Bell Incorporation | SG&A [Member] | 2017 Long-Term Incentive Plan
Description of Business and Accounting Policies [Line Items]
Number of outstanding awards granted | shares							0	0
Verizon Communications Inc. [Member]
Description of Business and Accounting Policies [Line Items]
Number of customers, exceeds 10% of total accounts receivable | Customer							1	1
Accounts receivable from one customer greater than 10%, percentage							23.00%	21.00%