SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES CASH AND CASH EQUIVALENTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents
Maximum term of original maturity to classify instruments as cash equivalent	3 months
Cash Flow, Noncash Investing and Financing Activities
Construction costs funded through accounts payable	$ 108.5	$ 92.4	$ 58.6
Portion of Westwood sale financed with note receivable	0	4.0	0
Equity issued for stock-based compensation plans	16.3	0	10.6
Equity issued for employee stock ownership plan	14.3	0	5.2
Equity issued for reinvested dividends	12.0	0	5.4
Contingent consideration related to the acquisition of Compass Energy Services	$ 7.8	$ 0	$ 0

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).

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- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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