Stock-Based Compensation Plans (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options exercisable (in shares)	1,211,358	1,077,988
Number of Shares
Beginning option balance (shares)	1,439,145
Options exercised (in shares)	(18,551)
Options forfeited (in shares)	(8,623)
Ending option balance (shares)	1,411,971
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 44.83
Options exercised (in dollars per share)	29.53
Options forfeited (in dollars per share)	68.02
Ending balance (in dollars per share)	$ 44.89