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Long-Term Debt (Details 2) (Interest rate swap agreements [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Effect of interest rate swap agreements
Location of Income (Loss), Description	Interest expense
Interest expense decrease	$ 13.4
Interest expense [Member]
Effect of interest rate swap agreements
Interest expense decrease	$ 13.4

- Definition

Description of where the net gain (loss) on interest rate derivatives not designated as hedging instruments are reported in the statement of income or other statement of financial performance.

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