Share-Based Compensation Share-Based Compensation Price Ranges (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	2,741,745
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	4 years 6 months 29 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 31.50
Exercisable Stock Options (in shares) | shares	1,820,919
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 23.86
Exercise Price Range 18.00 to 20.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	1,223,199
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	3 years 2 months 1 day
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 19.66
Exercisable Stock Options (in shares) | shares	1,223,199
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 19.66
Exercise Price Range 20.35 to 38.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	937,996
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	4 years 3 months 3 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 31.37
Exercisable Stock Options (in shares) | shares	596,970
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 32.43
Exercise Price Range 38.80 to 69.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	580,550
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	8 years 21 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 56.67
Exercisable Stock Options (in shares) | shares	750
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 57.91