Share-Based Compensation Plans (Details 2) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31 | shares	1,263
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding at December 31 (in dollars per share) | $ / shares	$ 68.13
Summary of stock option activity
Exercisable at December 31, Shares | shares	588
Exercisable at December 31, Weighted-Average Exercise Price | $ / shares	$ 53.72
Outstanding, weighted average remaining contractual term	6 years 7 months 18 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at January 1 | shares	1,269
Granted | shares	363
Exercised | shares	(282)
Forfeited or expired | shares	(87)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding at January 1 (in dollars per share) | $ / shares	$ 58.03
Granted (in dollars per share) | $ / shares	93.55
Exercised (in dollars per share) | $ / shares	54.26
Forfeited or expired (in dollars per share) | $ / shares	$ 71.63
Summary of stock option activity
Vested and expected to vest at December 31, Shares | shares	1,238
Vested and expected to vest at December 31, Weighted-Average Exercise Price | $ / shares	$ 67.63
Vested and expected to vest at December 31 in years	6 years 1 month 18 days
Exercisable at December 31, in years	4 years 4 months 18 days
Options outstanding at December 31, Aggregate Intrinsic Value | $	$ 3,326
Vested and expected to vest at December 31, Aggregate Intrinsic Value | $	3,358
Exercisable at December 31, Aggregate Intrinsic Value | $	$ 3,339