Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Auction rate securities		$ 44.5
Supplemental executive retirement plan assets	24.2	23.0
Derivatives, net	7.1	16.4
Total financial assets	24.2	83.9
Total Financial Liabilities	7.1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Auction rate securities
Supplemental executive retirement plan assets	24.2	23.0
Derivatives, net
Total financial assets	24.2	23.0
Total Financial Liabilities
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Auction rate securities
Supplemental executive retirement plan assets
Derivatives, net	7.1	16.4
Total financial assets		16.4
Total Financial Liabilities	7.1
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Auction rate securities		44.5
Supplemental executive retirement plan assets
Derivatives, net
Total financial assets		44.5
Total Financial Liabilities

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.

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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