Share-Based Compensation Plans (Details 2) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31 (in shares) | shares	1,529
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	$ 66.35
Summary of stock option activity
Exercisable at December 31 (in shares) | shares	725
Exercisable at December 31, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 65.35
Outstanding, weighted average remaining contractual term	7 years 1 month 6 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at January 1 (in shares) | shares	1,263
Granted (in shares) | shares	512
Exercised (in shares) | shares	(188)
Forfeited or expired (in shares) | shares	(58)
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	$ 68.13
Granted (in dollars per share) | $ / shares	55.32
Exercised (in dollars per share) | $ / shares	47.06
Forfeited or expired (in dollars per share) | $ / shares	$ 70.15
Summary of stock option activity
Vested and expected to vest at December 31 (in shares) | shares	1,473
Vested and expected to vest at December 31, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 66.42
Vested and expected to vest at December 31 in years	7 years
Exercisable at December 31, in years	5 years 4 months 24 days
Options outstanding at December 31, Aggregate Intrinsic Value | $	$ 18,400
Vested and expected to vest at December 31, Aggregate Intrinsic Value | $	17,727
Exercisable at December 31, Aggregate Intrinsic Value | $	$ 8,737