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Changes in Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cost of goods sold $ 1,568,600,000 $ 1,619,700,000 $ 2,813,200,000 $ 2,974,400,000
Stock repurchase program, authorized amount 1,050,000,000   1,050,000,000  
Stock repurchased and retired during period     120,000,000  
Stock repurchase program, outstanding balance authorized to be repurchased $ 123,900,000   123,900,000  
Accelerated Share Repurchase [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchased and retired during period     $ 120,000,000  
Stock repurchased and retired during period, shares     2,349,735