Stock-Based Compensation Restricted Stock Units Activity (Details) - RSU	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, shares, beginning of period	633,182
Outstanding, weighted average fair value, beginning of period | $ / shares	$ 68.76
Granted, shares	456,771
Granted, weighted average fair value | $ / shares	$ 57.18
DividendEquivalentUnitsGranted	10,165
DividendEquivalentUnitsWeightedAverageFairValueGrants | $ / shares	$ 44.63
Vested, shares	(195,649)
Vested, weighted average fair value | $ / shares	$ 67.26
Dividend Equivalent Units Vested	(26)
Dividend Equivalent Unit Weighted Average Vested Fair Value | $ / shares	$ 45.86
Forfeited, shares	(119,003)
Forfeited, weighted average fair value | $ / shares	$ 58.93
DividendEquivalentUnitsForfeited	(726)
DividendEquivalentUnitsForfeitedWeightedAverageFairValue | $ / shares	$ 45.51
Adjustments due to the Special Cash Dividend	88,836
Outstanding and nonvested, shares, end of period	873,550	[1],[2]
Outstanding and nonvested, weighted average fair value, end of period | $ / shares	$ 58.66	[1],[2]
Foreign Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and nonvested, shares, end of period	7,906
Vesting period, RSU award	4 years

[1] Includes 7,906 RSUs which were granted to foreign employees and which the Company expects to settle in cash. These RSUs generally vest over a four year period. The fair value of these RSUs at September 30, 2015 was not material.

[2] The weighted average fair value of outstanding RSUs as of September 30, 2015 reflects the adjustment for the Special Cash Dividend.