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Stock-Based Compensation (Details)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Number of common shares reserved for issuance    
Shares available for granting under the 2002 plan (in shares) 30.3 26.8
Options outstanding (in shares) 12.2 18.6
Total shares reserved for issuance (in shares) 42.5 45.4
Director Deferred Stock Ownership Plan [Member]
   
Number of common shares reserved for issuance    
Total shares reserved for issuance (in shares) 0.2