RISK MANAGEMENT ACTIVITIES - NETTING ARRANGEMENTS AND CASH COLLATERAL (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Derivative assets subject to master netting or similar arrangements, gross amount	$ 1.4	$ 2.2
Potential effects of netting, including cash collateral	0.3	0.6
Derivative assets subject to master netting or similar arrangements, net amount	1.1	1.6
Derivative assets not subject to master netting arrangement	1.8	0.2
Risk Management Asset	3.2	2.4
Total Risk Management Assets, Net Amount	2.9	1.8
Liabilities
Derivative liabilities subject to master netting or similar arrangements, gross amount	0.3	0.4
Potential effects of netting, including cash collateral	0.3	0.4
Derivative liabilities subject to master netting or similar arrangements, net amount	0	0
Derivative liabilities not subject to master netting arrangement	1.5	2.7
Risk Management Liability	1.8	3.1
Total Risk Management Liabilities, Net Amount	1.5	2.7
Cash collateral
Cash collateral provided to others related to contracts under master netting or similar arrangements	3.5	3.1
Cash collateral received from others related to contracts under master netting or similar arrangements	$ 0	$ 0.2