FAIR VALUE MEASUREMENTS (Measured on Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | | |
Jun. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets, Effect of Counter-party Netting | | $ (11.5) | $ (23.7) |
Derivative, Collateral, Obligation to Return Cash | | 11.5 | 23.7 |
Contingent consideration, final earn-out payment | $ 18.8 | | |
Other Assets | Pension Benefits | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Defined benefit plan, plan assets, amount | | 20.3 | 18.8 |
Fair Value, Measurements, Recurring | Commodity contracts | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liability, amount not offset against collateral | | 67.4 | 46.9 |
Derivative, Collateral, Right to Reclaim Cash | | (64.2) | (46.9) |
Derivative Liability | | 3.2 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liability, amount not offset against collateral | | 65.3 | 46.9 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liability, amount not offset against collateral | | 2.1 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative liability, amount not offset against collateral | | 0 | 0 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative, Collateral, Right to Reclaim Cash | | 0 | 0 |
Obligations, Fair Value Disclosure | | 473.7 | 429.8 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | 0 | 0 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | 473.7 | 429.8 |
Fair Value, Measurements, Recurring | Renewable energy credit and emissions obligations | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | 0 | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative, Collateral, Right to Reclaim Cash | | | 0 |
Obligations, Fair Value Disclosure | | | 21.6 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | | 0 |
Fair Value, Measurements, Recurring | Contingent consideration obligation | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Obligations, Fair Value Disclosure | | | 21.6 |
Fair Value, Measurements, Recurring | Money market funds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and cash equivalents | | 37.6 | 130.3 |
Fair Value, Measurements, Recurring | Money market funds | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and cash equivalents | | 37.6 | 130.3 |
Fair Value, Measurements, Recurring | Money market funds | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and cash equivalents | | 0 | 0 |
Fair Value, Measurements, Recurring | Money market funds | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash and cash equivalents | | 0 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets, amount not offset against collateral | | 64.2 | 80.1 |
Derivative assets, Effect of Counter-party Netting | | (64.2) | (46.9) |
Derivative assets, Net Carrying Value on Balance Sheet | | 0 | 33.2 |
Derivative, Collateral, Obligation to Return Cash | | 64.2 | 46.9 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets, amount not offset against collateral | | 61.6 | 80.1 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets, amount not offset against collateral | | 2.6 | 0 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Derivative assets, amount not offset against collateral | | $ 0 | $ 0 |