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FAIR VALUE MEASUREMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Long-term debt:    
Total long-term debt, carrying value $ 2,499,100,000 $ 2,699,400,000
$700 Million 4.875% 2021 Senior Note [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 700,000,000 700,000,000
Senior Notes One Point Three Billion [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 1,300,000,000.0 1,300,000,000.0
$400 Million 5.90% 2020 Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 400,000,000 400,000,000
$500 Million 3.95% 2018 Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 500,000,000.0 500,000,000.0
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 540,000,000  
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Original Face Value 544,200,000.0  
Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 2,200,000 2,300,000
Fair Value, Inputs, Level 2 [Member]    
Long-term debt:    
Total long-term debt, fair value 1,176,400,000 898,200,000
Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 98,000,000 69,400,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes One Point Three Billion [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 165,200,000 137,400,000
Fair Value, Inputs, Level 2 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 70,200,000 52,800,000
Fair Value, Inputs, Level 2 [Member] | $500 Million 3.95% 2018 Senior Notes [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 138,000,000 87,100,000
Fair Value, Inputs, Level 2 [Member] | Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 466,900,000 414,500,000
Fair Value, Inputs, Level 2 [Member] | Two hundred Eighteen Point Five Million Eight Point Zero Twenty Twenty One Point Five Lien Notes [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 94,000,000 0
Fair Value, Inputs, Level 2 [Member] | Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member]    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 141,900,000 134,700,000
Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]    
Long-term debt:    
Revolving loan, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 2,200,000 2,300,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Long-term debt:    
Total long-term debt, carrying value 2,516,600,000 2,699,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 334,700,000 410,600,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes One Point Three Billion [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 553,000,000 787,900,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 224,300,000 288,900,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $500 Million 3.95% 2018 Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 281,900,000 309,100,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 499,700,000 497,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Two hundred Eighteen Point Five Million Eight Point Zero Twenty Twenty One Point Five Lien Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 297,300,000 0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 323,500,000 403,200,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior Notes, Noncurrent 0 0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge $ 2,200,000 $ 2,300,000