PROPOSED MERGER (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Expected Acquisition Related Costs [Line Items]
Proposed Merger Common Stock Acquired By Third Party	80.6
Proposed Merger Percentage of Voting Interests Acquired by Third Party	50.50%
Proposed Merger Percentage of Voting Interests Retained by Existing Stockholders	49.50%
Proposed Merger Additional Common Stock to be Acquired by Third Party	6.9
Proposed Merger Cash and Debt Distribution by Third Party	$ 2,000,000,000
Proposed Merger Cash Portion of Cash and Debt Distribution by Third Party	875,000,000
Payments of Debt Issuance Costs	14,300,000	0
Proposed Merger Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan	50,000,000
Acquisition costs	10,400,000	200,000
Amortization of Financing Costs	400,000
Proposed Merger Upfront Payment for Long-Term Supply Arrangements	300,000,000
Minimum
Schedule of Expected Acquisition Related Costs [Line Items]
Proposed Merger Advisory, Legal, Accounting and Other Professional Fees and Integration Expenses	40,000,000
Proposed Merger Financing Fees	25,000,000
Maximum
Schedule of Expected Acquisition Related Costs [Line Items]
Proposed Merger Advisory, Legal, Accounting and Other Professional Fees and Integration Expenses	45,000,000
Proposed Merger Financing Fees	$ 30,000,000