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Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2019	Mar. 31, 2018
Fair Value Measurement [Domain]
Debt Instrument [Line Items]
Liabilities Subject to Compromise			$ 940.8
Liabilities Subject to Compromise			7,313.7				$ 0.0
Current maturities of long-term debt			0.0				124.8
Long-term Debt, Excluding Current Maturities			0.0				$ 5,923.5
Write-off of unamortized debt discounts, premiums and issuance costs			447.9
Letters of Credit Outstanding, Amount			115.1
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 27.0
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			6.875%
6.875% Senior notes due 2020 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.875%
Senior Note Maturity Year	2020
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.70%
4.70% Senior notes due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		4.70%
Senior Note Maturity Year		2021
4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.875%
4.875%SeniorNotesDue2022Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.875%
3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.00%
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.50%
4.50% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						4.50%
Senior Note Maturity Year						2024
4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.75%
4.75%SeniorNotesDue2024Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.75%
8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			8.00%
8.00% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.00%
Senior Note Maturity Year				2024
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.20%
5.20% Senior notes due 2025 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.20%
Senior Note Maturity Year					2025
7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.375%
7.38%SeniorNotesDue2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.375%
7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.75%
7.75% Senior notes due 2026 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage								7.75%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.20%
7.20% Senior notes due 2027 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage							7.20%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.875%
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.40%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.75%
5.75% Senior notes due 2044 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.75%	5.75%
Senior Note Maturity Year					2044	2044
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.85%
5.85%SeniorNotesDue2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.85%
Three percent exchangeable senior notes due twenty twenty four [Member]
Debt Instrument [Line Items]
Write-off of unamortized debt discounts, premiums and issuance costs			$ 128.8
Debt Instrument, Unamortized Discount			119.5
Debt Issuance Costs, Net			9.3
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt			7,096.3				$ 6,048.3
Liabilities Subject to Compromise			7,096.3
Long-term Debt, Excluding Current Maturities			0.0				5,923.5
Reported Value Measurement [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject to Compromise			6,500.0
Reported Value Measurement [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			122.9				124.8
Reported Value Measurement [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			100.7				113.2
Reported Value Measurement [Member] | 4.875%SeniorNotesDue2022Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			620.8				599.2
Reported Value Measurement [Member] | 3.00% Exchangeable senior notes due 2024 | Convertible Debt [Member]
Debt Instrument [Line Items]
Long-term Debt			849.5				699.0
Reported Value Measurement [Member] | 4.50% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			303.4				302.0
Reported Value Measurement [Member] | 4.75%SeniorNotesDue2024Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			318.6				276.5
Reported Value Measurement [Member] | 8.00% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			292.3				295.7
Reported Value Measurement [Member] | 5.20% Senior notes due 2025 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			333.7				331.7
Reported Value Measurement [Member] | 7.38%SeniorNotesDue2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			360.8				329.2
Reported Value Measurement [Member] | 7.75% Senior notes due 2026 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			1,000.0				987.1
Reported Value Measurement [Member] | 7.20% Senior notes due 2027 | Debentures Due 2027
Debt Instrument [Line Items]
Long-term Debt			112.1				111.7
Reported Value Measurement [Member] | 7.875% Senior notes due 2040 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			300.0				373.3
Reported Value Measurement [Member] | 5.40%SeniorNotesDue2042 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			400.0				262.8
Reported Value Measurement [Member] | 5.75% Senior notes due 2044 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			1,000.5				973.3
Reported Value Measurement [Member] | 5.85%SeniorNotesDue2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt			400.0				$ 268.8
Reported Value Measurement [Member] | Line of Credit [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt			581.0
Reported Value Measurement [Member] | Three percent exchangeable senior notes due twenty twenty four [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 849.5

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