Stock-Based Compensation Restricted Stock Units Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
RSU
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning of period (shares)	839,789
Granted (shares)	790,027
Vested (shares)	(295,625)
Forfeited (shares)	(79,282)
Outstanding and nonvested, shares, end of period (shares)	1,265,257	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted average fair value, beginning of period (usd per share) | $ / shares	$ 58.39
Granted, weighted average fair value (usd per share) | $ / shares	29.60
Vested, weighted average fair value (usd per share) | $ / shares	58.64
Forfeited, weighted average fair value (usd per share) | $ / shares	43.46
Outstanding and nonvested, weighted average fair value, end of period (usd per share) | $ / shares	$ 41.13	[1]
RSU | Foreign Employees
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding and nonvested, shares, end of period (shares)	19,954
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting period, award (years)	4 years
RSU Dividend Equivalent Unit (DEU)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (shares)	17,153
Dividend equivalent units vested (shares)	(5,415)
Dividend equivalent units forfeited (shares)	(1,390)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted, weighted average fair value (usd per share) | $ / shares	$ 37.68
Dividend equivalent units vested, weighted average fair value (usd per share) | $ / shares	41.51
Dividend equivalent units forfeited, weighted average fair value (usd per share) | $ / shares	$ 39.20

[1] Includes 19,954 RSUs which were granted to foreign employees and which the Company expects to settle in cash. The fair value of these RSUs at June 30, 2016 was not material. These RSUs generally vest over a four year period.