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Debt and Credit Agreements (Details 2) (USD $)	3 Months Ended
Debt and Credit Agreements (Details 2) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 1,877,000,000us-gaap_LongTermDebt		$ 1,752,000,000us-gaap_LongTermDebt
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	265,000,000		140,000,000
Long-term debt, weighted average interest rate	2.40%
Availability under the credit facility	$ 1,100,000,000
Weighted-average effective interest rate	2.60%	2.30%

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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