Debt (Details) - USD ($)	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Commercial paper outstanding	$ 100,000,000
Principal amount	2,872,983,000		$ 3,226,943,000
Less: unamortized discount	5,921,000		6,653,000
Plus: unamortized interest rate swap proceeds	27,128,000		31,716,000
Total debt	2,894,190,000		3,252,006,000
Less: current portion long-term debt	421,103,000		324,879,000
Long-term debt	2,473,087,000		$ 2,927,127,000
Repayments of debt	$ 354,909,000	$ 599,850,000
Notes due March 2015
Debt Instrument [Line Items]
Interest rate	5.00%		5.00%
Debt instrument, face amount	$ 0		$ 274,879,000
Repayments of debt	$ 275,000,000
Notes due January 2016
Debt Instrument [Line Items]
Interest rate	4.75%		4.75%
Debt instrument, face amount	$ 370,914,000		$ 370,914,000
Notes due September 2017
Debt Instrument [Line Items]
Interest rate	5.75%		5.75%
Debt instrument, face amount	$ 385,109,000		$ 385,109,000
Notes due March 2018
Debt Instrument [Line Items]
Interest rate	5.60%		5.60%
Debt instrument, face amount	$ 250,000,000		$ 250,000,000
Notes due May 2018
Debt Instrument [Line Items]
Interest rate	4.75%		4.75%
Debt instrument, face amount	$ 350,000,000		$ 350,000,000
Notes due March 2019
Debt Instrument [Line Items]
Interest rate	6.25%		6.25%
Debt instrument, face amount	$ 300,000,000		$ 300,000,000
Notes due November 2022
Debt Instrument [Line Items]
Interest rate	5.25%		5.25%
Debt instrument, face amount	$ 110,000,000		$ 110,000,000
Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%		4.625%
Debt instrument, face amount	$ 500,000,000		$ 500,000,000
Notes due January 2037
Debt Instrument [Line Items]
Interest rate	5.25%		5.25%
Debt instrument, face amount	$ 115,041,000		$ 115,041,000
Notes due March 2043
Debt Instrument [Line Items]
Interest rate	6.70%		6.70%
Debt instrument, face amount	$ 425,000,000		$ 425,000,000
Term loans
Debt Instrument [Line Items]
Debt instrument, face amount	50,000,000		130,000,000
Repayments of debt	80,000,000
Other debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 16,919,000		$ 16,000,000
Commercial Paper
Debt Instrument [Line Items]
Effective interest rate	0.49%

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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