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Earnings Per Share (Narrative) (Details) - January 2016 Share Repurchase Program
 9 Months Ended
Sep. 30, 2016
$ / shares
shares
Jan. 25, 2016
USD ($)
capital_program
Earnings Per Share Disclosure [Line Items]    
Capital expenditure and stock repurchase program, approved amount (up to) | $   $ 500,000,000
Capital expenditure and stock repurchase program, number of capital programs | capital_program   2
Stock repurchase program, shares acquired (in shares) | shares 3,238,760  
Stock repurchase program, average price per share (in dollars per share) | $ / shares $ 65.56