Stock-Based Compensation Restricted Stock Units Activity (Details) - 6 months ended Jun. 30, 2015 - RSU - $ / shares		Total
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		$ 68.76
Granted, shares		414,947
Granted, weighted average fair value		$ 58.04
DividendEquivalentUnitsGranted		4,124
DividendEquivalentUnitsWeightedAverageFairValueGrants		$ 54.32
Vested, shares		(192,901)
Vested, weighted average fair value		$ 65.80
Forfeited, shares		(54,097)
Forfeited, weighted average fair value		$ 64.59
DividendEquivalentUnitsForfeited		(34)
DividendEquivalentUnitsForfeitedWeightedAverageFairValue		$ 54.32
Adjustments due to the Special Cash Dividend		88,836
Outstanding and nonvested, shares, end of period	[1],[2]	894,057
Outstanding and nonvested, weighted average fair value, end of period	[1],[2]	$ 59.02
Foreign Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and nonvested, shares, end of period		6,810
Vesting period, RSU award		4 years

[1] Includes 6,810 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 June 30, 2015 was not material.

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