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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified									12 Months Ended
	Dec. 31, 2010	Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Money Market Funds [Member]	Dec. 31, 2010 Money Market Funds [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Money Market Funds [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Money Market Funds [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments					$ 12.6	$ 12.6
Total	$ 12.6	$ 12.6
Derivative maturity date									Dec. 31, 2010

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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