Commitments and Contingencies - Narrative (Details)		12 Months Ended
	Aug. 02, 2024 USD ($)	Dec. 31, 2024 USD ($) RenewalOption	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021	Sep. 07, 2021 USD ($)
Commitments And Contingencies [Line Items]
Other current liabilities		$ 26,800,000	$ 31,800,000
Other noncurrent liabilities		238,500,000	127,900,000
Jointly Owned Utility Plant Aggregate Construction Cost		235,000,000.0
Amount paid for dedicated fiber build		$ 4,700,000	16,300,000	$ 2,200,000
Up-Front Payments For Services, Upper Range, Years		25 years
Proceeds from sale of capacity, recorded in other noncurrent liabilities		$ 17,100,000	18,800,000
Proceeds from sale of capacity, recorded in other current liabilities		1,700,000	1,600,000
Insurance proceeds received for damage to equipment		7,600,000	300,000	$ 400,000
Liability for services to be delivered related to up-front payment received current		50,600,000	46,700,000
Letters of Credit Outstanding, Amount		25,000,000
Indemnification liability		0	0
Noncancellable purchase commitment		84,000,000
Other Current Liabilities [Member]
Commitments And Contingencies [Line Items]
Liability for services to be delivered related to up-front payment received current		4,300,000	4,100,000
Other Noncurrent Liabilities [Member]
Commitments And Contingencies [Line Items]
Liability for services to be delivered related to up-front payment received non current		89,400,000	79,500,000
Incremental liability related to tort claims		$ 93,500,000
Maximum [Member]
Commitments And Contingencies [Line Items]
SEA-US contract term		25 years
Indefeasible right of use of contract term		25 years
Long-term Purchase Commitments, Period		3 years
Minimum [Member]
Commitments And Contingencies [Line Items]
SEA-US contract term		15 years
Indefeasible right of use of contract term		15 years
Long-term Purchase Commitments, Period		1 year
Loss from Windstorm and Wildfires [Member]
Commitments And Contingencies [Line Items]
Amount payable to resolve tort claims arising from wildfires	$ 4,037,000,000.000
Loss from Windstorm and Wildfires [Member] | Hawaiian Telcom [Member]
Commitments And Contingencies [Line Items]
Amount payable to resolve tort claims arising from wildfires	100,000,000
Pole license agreement obligation [Member]
Commitments And Contingencies [Line Items]
Contract Term, in Years		10 years
Number of renewal options | RenewalOption		2
Renewal option term		5 years
Financing obligation remeasured and includes fair value step up						$ 12,200,000
Other installment financing arrangements		$ 40,800,000	43,600,000
Other current liabilities		$ 3,000,000	2,800,000
Dedicated Fiber Agreement [Member]
Commitments And Contingencies [Line Items]
Indefeasible right of use of contract term		20 years			20 years
Liability for services to be delivered related to up-front payment received		$ 65,700,000	58,600,000
Dedicated Fiber Agreement [Member] | Other Current Liabilities [Member]
Commitments And Contingencies [Line Items]
Liability for services to be delivered related to up-front payment received current		2,200,000	2,100,000
Dedicated Fiber Agreement [Member] | Other Noncurrent Liabilities [Member]
Commitments And Contingencies [Line Items]
Liability for services to be delivered related to up-front payment received non current		63,500,000	56,500,000
Involuntary Events and Contingencies [Member]
Commitments And Contingencies [Line Items]
Other current liabilities			2,000,000
Other noncurrent liabilities			2,000,000
Insurance proceeds received for damage to equipment		7,000,000
General insurance liability			4,000,000
Legal fees		11,600,000
Involuntary Events and Contingencies [Member] | Selling, General and Administrative [Member]
Commitments And Contingencies [Line Items]
Legal fees		3,200,000
Involuntary Events and Contingencies [Member] | Insurance Receivable [Member]
Commitments And Contingencies [Line Items]
Legal fees		8,400,000
Involuntary Events and Contingencies [Member] | Other Noncurrent Liabilities [Member]
Commitments And Contingencies [Line Items]
General insurance liability		97,500,000
Involuntary Events and Contingencies [Member] | Other Noncurrent Assets [Member]
Commitments And Contingencies [Line Items]
Offsetting receivable		$ 96,600,000	$ 2,000,000
One'Ohana Initiative Voluntary Fund [Member]
Commitments And Contingencies [Line Items]
Insurance voluntary fund	$ 2,500,000