FAIR VALUE MEASUREMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge	$ 1.5	$ 1.9
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt:
Total long-term debt, fair value	1,689.4	2,192.6
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge	1.5	1.9
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Long-term debt:
Total long-term debt, fair value	1,620.2	2,224.6
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Long-term debt:
Fair Value Adjustment to Interest Rate Hedge	1.5	1.9
Senior Notes [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	540.0	540.0
Senior Notes [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	0.0	218.5
Senior Notes [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	0.0	544.2
Senior Notes [Member] | $1,075 Million 5.75% 2025 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	1,075.0	0.0
Senior Notes [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	400.0	400.0
Senior Notes [Member] | $500 million 4.80% 2020 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	500.0	500.0
Senior Notes [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	700.0	700.0
Senior Notes [Member] | $800 Million 6.25% 2040 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Original Face Value	800.0	800.0
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value	0.0	506.3
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Long-term debt:
Total long-term debt, fair value	0.0	339.1
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $1,075 Million 5.75% 2025 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	1,046.8	0.0
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	88.5	224.5
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 million 4.80% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	122.0	235.9
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Long-term debt:
Total long-term debt, fair value	138.0	308.2
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	292.6	292.5
Senior Notes [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value	0.0	284.2
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $540 Million 8.25% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value	0.0	595.0
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $544 Million 7.75% 2020 Lien Notes[Member]
Long-term debt:
Total long-term debt, fair value	0.0	439.7
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $1,075 Million 5.75% 2025 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	1,032.0	0.0
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	88.4	219.6
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $500 million 4.80% 2020 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	116.9	221.1
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
Long-term debt:
Total long-term debt, fair value	132.4	283.1
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member]
Long-term debt:
Total long-term debt, fair value	249.0	234.7
Senior Notes [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | $218.5 Million 8.00% 2020 Lien Notes [Member]
Long-term debt:
Total long-term debt, fair value	0.0	229.5
Line of Credit [Member] | Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
Long-term debt:
Total long-term debt, fair value	0.0	0.0
Line of Credit [Member] | Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
Long-term debt:
Total long-term debt, fair value	$ 0.0	$ 0.0