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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Redeemable Common Units | Alloy Inc    
FAIR VALUE MEASUREMENTS AND INVESTMENTS    
Fair value of units $ 15.0 $ 15.0
Historical cost of redeemable units 10.1 10.1
Redeemable Common Units | Alaska Communications    
FAIR VALUE MEASUREMENTS AND INVESTMENTS    
Fair value of units 0.0 0.0
Warrants | Alaska Communications    
FAIR VALUE MEASUREMENTS AND INVESTMENTS    
Financial instruments 0.0 0.0
Carrying Value    
FAIR VALUE MEASUREMENTS AND INVESTMENTS    
Long-term debt 570.2 565.2
Customer receivable credit facility 37.4 39.6
Level 2 | Total    
FAIR VALUE MEASUREMENTS AND INVESTMENTS    
Long-term debt 576.3 572.3
Customer receivable credit facility $ 37.0 $ 39.2