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Supplemental Guarantor Information (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Senior Notes Due May 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 550,000,000	$ 550,000,000
Senior Notes Due April 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 300,000,000	$ 0

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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