SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract Acquisition Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retail revenue period for billing postpaid customers in advance	1 month
Contract liability	$ 68.7
Expected amortization period, when the Company utilizes the practical expedient and expenses the costs as incurred	true
Alaska communications
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liabilities in its acquisitions	$ 92.7
Renewable Energy | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization period	2 years
Renewable Energy | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization period	6 years