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Debt (Narrative) (Details)	3 Months Ended				12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017 USD ($)	Dec. 31, 2013	Dec. 31, 2012 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Feb. 09, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jan. 05, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Tender Offer						$ 985,000,000.0
Debt Instrument, Repurchased Face Amount					$ 951,800,000	721,800,000	$ 194,100,000			$ 595,400,000
Extinguishment of Debt, Gain (Loss), Net of Tax						19,000,000.0
Debt Instrument, Repurchase Amount					724,100,000	771,200,000	204,500,000
Gain (Loss) on Extinguishment of Debt		$ 6,200,000			194,100,000	(19,000,000.0)	(2,600,000)
Interest Expense					428,300,000	282,700,000	224,200,000
Capitalized interest					$ 20,900,000	62,600,000	72,500,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage					100.00%
Debentures Due 2027
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage					100.00%
7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.375%
Senior Note Maturity Year					2025
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.40%
Senior Note Maturity Year					2042
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.85%
Senior Note Maturity Year					2044
3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					3.00%
Senior Note Maturity Year					2024
7.875% Senior Notes Due 2040 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.875%
Senior Note Maturity Year					2040
4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.875%
Senior Note Maturity Year					2022
4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.75%
Senior Note Maturity Year					2024
7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.75%
Senior Note Maturity Year					2026
5.20% Senior notes due 2025(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.20%
Senior Note Maturity Year					2025
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.75%
Senior Note Maturity Year					2044
4.50% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.50%
Senior Note Maturity Year					2024
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.70%
Senior Note Maturity Year					2021
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					6.875%
Senior Note Maturity Year					2020
8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					8.50%
Senior Note Maturity Year					2019
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.875%
Senior Note Maturity Year					2040
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.20%
Senior Note Maturity Year					2027
8.00% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					8.00%
Senior Note Maturity Year					2024
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						1,600,000,000							$ 2,000,000,000.0
Potential_Additional_Revolver_Capacity					$ 250,000,000.0
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
Debt Covenant, Additional Secured Debt, Value					$ 1,000,000,000
Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth					10.00%
Common Stock, Dividends, Per Share, Cash Paid | $ / shares					$ 0.01
Debt Covenant, Aggregate Amount Of Available Cash					$ 200,000,000
Revolving Credit Facility [Member] | Credit Facility due 2020 [Member]
Debt Instrument [Line Items]
Current borrowing capacity					1,200,000,000								$ 1,300,000,000
Revolving Credit Facility [Member] | Credit Facility due 2019 [Member]
Debt Instrument [Line Items]
Current borrowing capacity					$ 1,600,000,000
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					3.25%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate					4.25%
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					8.00%
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					17.8336
Debt Instrument, Convertible, Conversion Price | $ / shares					$ 56.08
Interest Expense, Debt, Excluding Amortization					$ 25,500,000
Amortization of Debt Issuance Costs and Discounts					$ 32,500,000	31,000,000.0	31,400,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount							311,200,000									1,093,100,000
Senior Notes [Member] | 7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.375%
Debt Instrument, Face Amount					$ 500,000,000.0
Debt Instrument, Repurchased Face Amount					139,200,000
Debt Instrument, Repurchase Amount					$ 109,200,000
Senior Notes [Member] | 5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.40%
Debt Instrument, Face Amount					$ 400,000,000.0
Senior Notes [Member] | 5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.85%
Debt Instrument, Face Amount					$ 400,000,000.0
Senior Notes [Member] | 7.875% Senior Notes Due 2040 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.875%
Debt Instrument, Face Amount					$ 201,400,000
Senior Notes [Member] | 4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.875%
Debt Instrument, Face Amount					$ 620,800,000
Senior Notes [Member] | 4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					4.75%
Debt Instrument, Face Amount					$ 398,100,000
Debt Instrument, Repurchased Face Amount					79,500,000
Debt Instrument, Repurchase Amount					$ 61,200,000
Senior Notes [Member] | 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										7.75%
Debt Issuance Costs, Gross										$ (16,500,000)
Debt Instrument, Face Amount						1,000,000,000.0			$ 1,000,000,000.0
Senior Notes [Member] | 5.20% Senior notes due 2025(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.20%	5.20%
Debt Instrument, Face Amount																700,000,000.0
Senior Note Maturity Year					2025
Debt Instrument, Unamortized Discount (Premium), Net		$ 2,600,000
Debt Instrument, Repurchased Face Amount					$ 335,500,000											30,700,000
Debt Instrument, Repurchase Amount					250,000,000.0
Senior Notes [Member] | 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		5.75%						5.75%
Debt Instrument, Face Amount		$ 400,000,000.0						$ 625,000,000.0
Senior Note Maturity Year	2044							2044
Debt Instrument, Unamortized Discount (Premium), Net		$ 18,700,000						$ 2,800,000
Debt Instrument, Repurchased Face Amount																24,500,000
Senior Notes [Member] | 4.50% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.50%				4.50%
Debt Instrument, Face Amount								$ 625,000,000.0
Senior Note Maturity Year								2024
Debt Instrument, Unamortized Discount (Premium), Net								$ 900,000
Debt Instrument, Repurchased Face Amount					320,000,000.0											1,700,000
Debt Instrument, Repurchase Amount					$ 240,000,000.0
Senior Notes [Member] | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.70%
Debt Instrument, Face Amount				$ 1,500,000,000
Senior Note Maturity Year			2021	2021
Debt Instrument, Unamortized Discount (Premium), Net				$ 29,600,000
Debt Instrument, Repurchased Face Amount						$ 156,200,000	413,300,000			156,200,000				$ 39,400,000		817,000,000.0
Debt Instrument, Repurchase Amount										159,700,000				39,300,000
Senior Notes [Member] | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.875%
Debt Instrument, Face Amount				$ 900,000,000.0
Senior Note Maturity Year			2020	2020
Debt Instrument, Repurchased Face Amount							$ 229,900,000			71,400,000	$ 328,000,000.0			100,100,000		219,200,000
Debt Instrument, Repurchase Amount											$ 354,700,000			105,100,000
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.50%
Debt Instrument, Face Amount				$ 500,000,000.0
Senior Note Maturity Year				2019	2019
Debt Instrument, Repurchased Face Amount										$ 55,000,000.0		$ 237,600,000		54,600,000
Debt Instrument, Repurchase Amount												$ 256,800,000		$ 60,100,000
Senior Notes [Member] | 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.875%
Debt Instrument, Face Amount				$ 300,000,000.0												$ 300,000,000.0
Senior Note Maturity Year				2040
Senior Notes [Member] | 7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.20%		7.20%
Debt Instrument, Face Amount						$ 150,000,000.0
Debt Instrument, Repurchased Face Amount					$ 37,900,000
Debt Instrument, Repurchase Amount					$ 29,900,000
Senior Notes [Member] | 8.00% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.00%	8.00%	8.00%
Debt Instrument, Face Amount					$ 332,000,000.0
Senior Note Maturity Year					2024
Debt Instrument, Repurchased Face Amount					$ 39,700,000
Debt Instrument, Repurchase Amount					$ 33,800,000
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
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
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(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 332,000,000.0

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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