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Stock-Based Compensation Plans - Stock Option Activity (Details) - Stock Options - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Shares outstanding, beginning of period (in shares) 10 193 201
Shares granted (in shares) 0 0 0
Shares exercised (in shares) (1) (182) (7)
Shares cancelled/forfeited (in shares) 0 (1) (1)
Shares outstanding, end of period (in shares) 9 10 193
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Shares outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 48.63 $ 36.04 $ 36.30
Shares granted, weighted average exercise price (in dollars per share) 0.00 0.00 0.00
Shares exercised, weighted average exercise price (in dollars per share) 49.95 35.26 42.94
Shares cancelled/forfeited, weighted average exercise price (in dollars per share) 0.00 49.95 36.12
Shares outstanding, weighted average exercise price, end of period (in dollars per share) $ 48.37 $ 48.63 $ 36.04