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Share-Based Compensation Plans - Outstanding and Exercisable Options (Details)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 33
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding (in shares) | shares 934,325
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 50.26
Options Exercisable (in shares) | shares 934,325
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 50.26
Range of Exercise Price $33 - $38  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 33
Range of exercise price, upper limit (in dollars per share) $ 38
Options Outstanding (in shares) | shares 71,000
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 34.79
Options Exercisable (in shares) | shares 71,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 34.79
Range of Exercise Price $42 - $45  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 42
Range of exercise price, upper limit (in dollars per share) $ 45
Options Outstanding (in shares) | shares 312,425
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 43.01
Options Exercisable (in shares) | shares 312,425
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 43.01
Range of Exercise Price $55 - $56  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 55
Range of exercise price, upper limit (in dollars per share) $ 56
Options Outstanding (in shares) | shares 508,900
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 2 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 55.73
Options Exercisable (in shares) | shares 508,900
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 55.73
Range of Exercise Price $61 - $67  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) 61
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding (in shares) | shares 42,000
Options Outstanding, Weighted Average Remaining Contractual Life (In Years) 2 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 64.16
Options Exercisable (in shares) | shares 42,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 64.16