Restructuring Restructuring Costs (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2016 USD ($) numberofemployees		Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) numberofemployees		Jun. 30, 2015 USD ($)	Jan. 26, 2016
Restructuring Cost and Reserve [Line Items]
Revenue		$ 756,030		$ 738,395	$ 1,488,001		$ 1,488,751
Restructuring Revenue				13,400			28,300
Restructuring Loss				1,500			5,800
Restructuring charges		$ 16,085		0	$ 28,529		0
Number of employees terminated | numberofemployees		250			750
North America [Member]
Restructuring Cost and Reserve [Line Items]
Revenue	[1]	$ 516,922		481,282	$ 1,017,735		961,164
Restructuring charges		2,800			8,400
EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Revenue	[1]	198,305		204,047	387,275		420,267
Restructuring charges		12,700			16,200
ROW [Member]
Restructuring Cost and Reserve [Line Items]
Revenue		40,803		$ 53,066	82,991		$ 107,320
Restructuring charges		600			3,900
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					50,800
Restructuring charges		14,444	[2]		25,763	[3]
Employee Severance [Member] | North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,488			6,213
Employee Severance [Member] | EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		12,562			15,829
Employee Severance [Member] | ROW [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		394			3,721
Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					7,300
Restructuring charges		0			45
Asset Impairments Related to Restructuring [Member] | North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0			45
Asset Impairments Related to Restructuring [Member] | EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0			0
Asset Impairments Related to Restructuring [Member] | ROW [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0			0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,641			2,721
Other Restructuring [Member] | North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,318			2,167
Other Restructuring [Member] | EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		121			329
Other Restructuring [Member] | ROW [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 202			$ 225
Facility Closing [Member] | EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Number of Countries in which Entity Operates		11			11			4
Facility Closing [Member] | ROW [Member]
Restructuring Cost and Reserve [Line Items]
Number of Countries in which Entity Operates		6			6

[1] North America includes revenue from the United States of $508.8 million and $474.5 million for the three months ended June 30, 2016 and 2015, respectively, and $1,001.4 million and $947.6 million for the six months ended June 30, 2016 and 2015, respectively. EMEA includes revenue from Switzerland of $130.2 million and $113.7 million for the three months ended June 30, 2016 and 2015, respectively, and $243.5 million and $231.2 million for the six months ended June 30, 2016 and 2015, respectively. There were no other individual countries that represented more than 10% of consolidated total revenue for the three and six months ended June 30, 2016 and 2015.

[2] The employee severance and benefit costs for the three months ended June 30, 2016 relates to the termination of approximately 250 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through December 31, 2017.

[3] The employee severance and benefit costs for the six months ended June 30, 2016 relates to the termination of approximately 750 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through December 31, 2017.