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OTHER CONTINGENCIES AND COMMITMENTS (2015 Gas Transmission and Storage Rate Case and 2011-2014 Gas Transmission and Storage Capital Expenditures Audit) (Details) - Disallowance of Plant Costs - USD ($) $ in Millions | Jul. 07, 2021 | Jun. 23, 2016 | Jul. 31, 2020
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Loss Contingencies [Line Items] |  |  |
Gas transmission and storage capital disallowance |  | $ 696.0 |
Permanently disallowed capital |  | 120.0 |
Amount subject to audit |  | $ 576.0 |
Capital expenditures for future recovery |  |  | $ 512.0
Loss Contingency Nature, Period One |  |  |
Loss Contingencies [Line Items] |  |  |
Capital expenditures for future recovery, seeking recovery |  |  | $ 416.3
Capital expenditures for future recovery, pending authorization | $ 356.3 |  |
Loss Contingency Nature, Period Two |  |  |
Loss Contingencies [Line Items] |  |  |
Capital expenditures for future recovery, pending authorization | $ 313.3 |  |
Capital expenditures for future recovery, pending authorization, amortization period | 60 months |  |
Loss Contingency Nature, Period Three |  |  |
Loss Contingencies [Line Items] |  |  |
Capital expenditures for future recovery, pending authorization | $ 43.0 |  |
Capital expenditures for future recovery, pending authorization, amortization period | 12 months |  |

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