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REVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligation (Details) $ in Millions	Sep. 30, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 231.0
APCo
Disaggregation of Revenue [Line Items]
Fixed performance obligations	74.3
I&M
Disaggregation of Revenue [Line Items]
Fixed performance obligations	19.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 21.8
Fixed performance obligations, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | APCo
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 4.0
Fixed performance obligations, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | I&M
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 1.1
Fixed performance obligations, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 144.1
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | APCo
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 32.2
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | I&M
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 8.8
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 49.0
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | APCo
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 26.5
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | I&M
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 6.8
Fixed performance obligations, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 16.1
Fixed performance obligations, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01 | APCo
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 11.6
Fixed performance obligations, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01 | I&M
Disaggregation of Revenue [Line Items]
Fixed performance obligations	$ 2.4
Fixed performance obligations, period

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