Bank Credit Agreements and Other Short-Term and Long-Term Debt (Convertible senior notes) (Details) (USD $)	1 Months Ended
	Oct. 31, 2006	Sep. 30, 2011
Convertible Senior Notes [Abstract]
Debt Instrument Convertible Initial Principal Amount	$ 230,000,000
Debt Instrument Covertible, Maturity Date	2026
Interest Per annum on Notes	2.25%
Debt Instrument Convertible Principal Amount Per Note		1,000
Debt Instrument Convertible Amount Retired		134,000,000
Debt Instrument Convertible Principle And Interest Paid		$ 136,000,000