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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data
1 Months Ended3 Months Ended9 Months Ended
Feb. 28, 2006
Oct. 31, 2005
Oct. 31, 2002
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Shareholders' Equity [Abstract]       
Stock repurchase program, authorized amount$ 200$ 100$ 100    
Total stock repurchase authorization   400 400 
Shares repurchased under authorized repurchase programs   9,688,900 9,688,900 
Stock repurchases, shares   0000
Value of shares repurchased under authorized repurchase programs   297.7 297.7 
Remaining value of stock repurchase programs authorization     102.3 
Value of shares repurchased from employees, separate from other authorizations     $ 2.0$ 3.1