The amount of aggregate insurance coverage limit.

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The area impacted, measured in miles, by a crude oil pipeline release.

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The amount of crude oil released, measured in number of barrels, associated with a crude oil pipeline leak.

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Amount paid by a company related to fines and/or penalties to government entities during the period.

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The amount of remaining aggregate insurance coverage.

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The total amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of cash outflow to settle environmental loss contingencies.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Amount of any recovery from third parties that is credited to environmental remediation costs.

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The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 15, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2013 USD ($)	Jul. 26, 2010 Miles bbl
Site Contingency [Line Items]
Remaining liabilities		$ 23.6		$ 99.8
Accrual for environmental loss contingencies		55.3		50.8
Costs paid associated with crude oil release		70.4	$ 12.9
Government fines and penalties	$ 67.8
Aggregate insurance coverage limit		650.0
Insurance recoveries, since inception		547.0
Remaining aggregate insurance coverage						$ 145.0
Remaining expected insurance recoveries		103.0			$ 85.0
Estimated total loss of crude oil release		1,215.0
Disputes with Insurers for Which Partial Payment Was Received [Member]
Site Contingency [Line Items]
Insurance recoveries		42.0
Dispute with One Particular Insurer [Member]
Site Contingency [Line Items]
Remaining expected insurance recoveries		85.0
Liability Program [Member]
Site Contingency [Line Items]
Aggregate insurance coverage limit		940.0
Line 6A Crude Oil Release [Member]
Site Contingency [Line Items]
Government fines and penalties	1.0
Consent Decree [Member]
Site Contingency [Line Items]
Accrual for environmental loss contingencies	110.0
Civil Penalties [Member]
Site Contingency [Line Items]
Government fines and penalties	61.0
Past Removal Costs and Interest [Member]
Site Contingency [Line Items]
Government fines and penalties	$ 5.8
Line Six Marshall Leak [Member]
Site Contingency [Line Items]
Remaining liabilities		67.9		$ 138.8
Crude oil released (in barrels) \| bbl							20,000
Area Impacted By Crude Oil Release \| Miles							38
Government fines and penalties		68.5
Estimated total loss of crude oil release		$ 1,200.0