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Summary of Financial Instruments Carrying and Fair Values (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred purchase price receivable collection period	30 days
Long-term debt, including current portion	$ 3,140,800,000	$ 3,452,200,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	3,140,800,000	3,452,200,000
Derivative assets	149,100,000	142,500,000
Derivative liabilities	178,100,000	181,700,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	3,274,000,000	3,623,400,000
Derivative assets	149,100,000	142,500,000
Derivative liabilities	$ 178,100,000	$ 181,700,000

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

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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