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Debt (Narrative) (Details) - USD ($)	3 Months Ended							12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2018	Feb. 28, 2018	Feb. 09, 2018	Feb. 07, 2018	Oct. 31, 2017	Sep. 30, 2017	Jan. 05, 2017
Debt Instrument [Line Items]
Document Period End Date								Dec. 31, 2018
Tender Offer								$ 985,000,000
Debt Instrument, Repurchased Face Amount								721,800,000
Extinguishment of Debt, Gain (Loss), Net of Tax		$ 19,000,000
Debt Instrument, Repurchase Amount								771,200,000
Stock Issued During Period, Shares, New Issues	65,550,000		1,822,432						1,822,432
Gain (Loss) on Extinguishment of Debt				$ 6,200,000				(19,000,000)	$ (2,600,000)	$ 287,800,000
Interest Expense								282,700,000	224,200,000	228,800,000
Capitalized interest								$ 62,600,000	$ 72,500,000	45,700,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage									0.00%
Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage									0.00%
3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Senior Note Maturity Year								2024
Debt instrument, interest rate, stated percentage								3.00%
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Senior Note Maturity Year								2025
Debt instrument, interest rate, stated percentage								5.20%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Senior Note Maturity Year								2044
Debt instrument, interest rate, stated percentage								5.75%
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Senior Note Maturity Year								2024
Debt instrument, interest rate, stated percentage								4.50%
4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Senior Note Maturity Year								2021
Debt instrument, interest rate, stated percentage								4.70%
6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Senior Note Maturity Year								2020
Debt instrument, interest rate, stated percentage								6.875%
Debt Instrument, Repurchased Face Amount								$ 328,000,000
Debt Instrument, Repurchase Amount								$ 354,700,000
8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Senior Note Maturity Year								2019
Debt instrument, interest rate, stated percentage								8.50%
Debt Instrument, Repurchased Face Amount								$ 237,600,000
Debt Instrument, Repurchase Amount								$ 256,800,000
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Senior Note Maturity Year								2040
Debt instrument, interest rate, stated percentage								7.875%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Senior Note Maturity Year								2027
Debt instrument, interest rate, stated percentage								7.20%
8.00% Senior notes due 2024
Debt Instrument [Line Items]
Senior Note Maturity Year								2024
Debt instrument, interest rate, stated percentage								8.00%
Open Market Repurchases [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								$ 194,100,000
Debt Instrument, Repurchase Amount								204,500,000
Revolving Credit Facility [Member] | Five Year Credit Facility Member
Debt Instrument [Line Items]
Current borrowing capacity			$ 2,000,000,000					2,000,000,000	$ 2,000,000,000							$ 2,250,000,000
Potential_Additional_Revolver_Capacity								$ 1,500,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.75%
Maximum Percent of Debt to Total Capitalization Ratio								60.00%
Line of Credit Facility, Fair Value of Amount Outstanding			0						$ 0
Debt Covenant, Additional Secured Debt, Value								$ 750,000,000
Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth								10.00%
Common Stock, Dividends, Per Share, Cash Paid								$ 0.01
Debt Covenant, Aggregate Amount Of Available Cash								$ 150,000,000
Revolving Credit Facility [Member] | Credit Facility due 2020 [Member]
Debt Instrument [Line Items]
Current borrowing capacity								1,300,000,000								$ 1,130,000,000
Revolving Credit Facility [Member] | Credit Facility due 2019 [Member]
Debt Instrument [Line Items]
Current borrowing capacity								$ 1,200,000,000
Debt Covenant, Period For Repayment Of Acquired Companies								90 days
Debt Covenant, Aggregate Amount Of Available Cash, After Repayments								$ 250,000,000
Revolving Credit Facility [Member] | Base Rate [Member] | Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate									3.00%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate									4.00%
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization								25,500,000	$ 25,500,000
Amortization of Debt Issuance Costs and Discounts								31,000,000	31,400,000
Debt Instrument, Face Amount			849,500,000					$ 849,500,000	849,500,000
Senior Note Maturity Year								2024
Conversion rate per $1,000 principal amount of shares								71.3343
Debt Instrument, Convertible, Conversion Price								$ 14.02
Debt instrument, interest rate, stated percentage								8.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount																	$ 194,100,000
Debt Instrument, Repurchase Amount																	204,500,000
Senior Notes [Member] | 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 1,000,000,000
Debt instrument, interest rate, stated percentage		7.75%
Senior Notes [Member] | 5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 700,000,000
Senior Note Maturity Year								2025
Debt instrument, interest rate, stated percentage								5.20%
Debt Instrument, Unamortized Discount (Premium), Net				2,600,000
Senior Notes [Member] | 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 400,000,000							$ 625,000,000
Senior Note Maturity Year					2044						2044
Debt instrument, interest rate, stated percentage				5.75%							5.75%
Debt Instrument, Unamortized Discount (Premium), Net				$ 18,700,000							$ 2,800,000
Debt Instrument, Repurchased Face Amount			24,500,000						24,500,000
Gain (Loss) on Extinguishment of Debt									8,800,000
Senior Notes [Member] | 4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 625,000,000
Senior Note Maturity Year											2024
Debt instrument, interest rate, stated percentage											4.50%
Debt Instrument, Unamortized Discount (Premium), Net											$ 850,000
Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 1,500,000,000
Senior Note Maturity Year						2021	2021
Debt instrument, interest rate, stated percentage							4.70%
Debt Instrument, Unamortized Discount (Premium), Net							$ 29,600,000
Debt Instrument, Repurchased Face Amount		$ 156,200,000	413,300,000					$ 156,200,000	413,300,000								39,400,000
Debt Instrument, Repurchase Amount		159,700,000															39,300,000
Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 900,000,000
Senior Note Maturity Year						2020	2020
Debt instrument, interest rate, stated percentage							6.875%
Debt Instrument, Repurchased Face Amount			229,900,000					328,000,000	$ 229,900,000				$ 71,400,000		$ 256,600,000		100,100,000
Debt Instrument, Repurchase Amount																	105,100,000
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 500,000,000
Senior Note Maturity Year							2019		2019
Debt instrument, interest rate, stated percentage							8.50%
Debt Instrument, Repurchased Face Amount			200,400,000					237,600,000	$ 200,400,000				$ 55,000,000	$ 182,600,000			54,600,000
Debt Instrument, Repurchase Amount																	$ 60,100,000
Senior Notes [Member] | 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 300,000,000
Senior Note Maturity Year							2040
Debt instrument, interest rate, stated percentage							7.875%
Senior Notes [Member] | 7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 150,000,000						$ 150,000,000
Debt instrument, interest rate, stated percentage			7.20%						7.20%
Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 332,000,000					$ 332,000,000	$ 332,000,000
Senior Note Maturity Year								2024	2024
Debt instrument, interest rate, stated percentage			8.00%					8.00%	8.00%
Exchange Offers [Member]
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)		3,500,000
Amortization of Debt Issuance Costs		$ 2,700,000
Exchange Offers [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount																		$ 649,500,000
Debt Instrument, Repurchase Amount																		664,500,000
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount																		373,900,000
Debt Instrument, Repurchase Amount																		362,500,000
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount																		129,800,000
Debt Instrument, Repurchase Amount																		138,700,000
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount																		145,800,000
Debt Instrument, Repurchase Amount																		163,300,000
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount																		$ 332,000,000

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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