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Indebtedness (Carrying Amount Of The Convertible Senior Subordinated Notes) (Details) (1 1/4% Convertible Senior Subordinated Notes Due 2036 [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
1 1/4% Convertible Senior Subordinated Notes Due 2036 [Member]
Debt Instrument [Line Items]
Carrying amount of the equity component	$ 54.3	$ 54.3
Principal amount of the liability component	201.3	201.3
Less: unamortized discount	(11.4)	(17.9)
Net carrying amount	$ 189.9	$ 183.4

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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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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