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(Aggregate Maturities Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Feb. 07, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 721.8
Long-Term Debt, Gross	5,161.0						$ 6,549.5
8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	237.6
6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	328.0
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								$ 194.1
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										$ (1,155.1)
Debt Instrument, Repurchased Face Amount Net of Exchanged Notes							(511.6)
Debt Instrument, Repurchased Face Amount Net of Debt Issuance	278.2
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	237.6			$ 55.0	$ 182.6		200.4	54.6
Long-Term Debt, Maturities, Repayments of Principal in Year Three							500.0
Long-Term Debt, Maturities, Repayments of Principal in Year Four	0.0
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										(62.0)
Debt Instrument, Face Amount												$ 500.0
Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	328.0			$ 71.4		$ 256.6	229.9	100.1
Long-Term Debt, Maturities, Repayments of Principal in Year Four							900.0
Long-Term Debt, Maturities, Repayments of Principal in Year Five	122.9
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										(219.2)
Debt Instrument, Face Amount												900.0
Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	156.2		$ 156.2				413.3	$ 39.4
Long-Term Debt, Maturities, Repayments of Principal in Year Five							1,500.0
Long-Term Debt, Maturities, Repayments of Principal after Year Five	113.5
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										(817.0)
Debt Instrument, Face Amount												1,500.0
Senior Notes [Member] | 4.50% Senior notes due 2024
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	623.3						625.0
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										(1.7)
Debt Instrument, Face Amount											$ 625.0
Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	332.0						0.0
Debt Instrument, Face Amount	332.0						332.0
Senior Notes [Member] | 5.20% Senior notes due 2025
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	669.3						700.0
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										(30.7)
Debt Instrument, Face Amount										700.0
Senior Notes [Member] | 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	1,000.0						0.0
Debt Instrument, Face Amount		$ 1,000.0
Senior Notes [Member] | 7.20% Senior notes due 2027
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	150.0						150.0
Debt Instrument, Face Amount							150.0
Senior Notes [Member] | 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	300.0						300.0
Debt Instrument, Face Amount												$ 300.0
Senior Notes [Member] | 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount							24.5
Long-Term Debt, Maturities, Repayments of Principal after Year Five	1,000.5						1,025.0
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges										$ (24.5)
Debt Instrument, Face Amount									$ 400.0		$ 625.0
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Long-Term Debt, Maturities, Repayments of Principal after Year Five	849.5						849.5
Debt Instrument, Face Amount	$ 849.5						$ 849.5

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