Restructuring - Rollforward of Restructuring Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Restructuring Reserve [Roll Forward]
Liability as of January 1, 2020	$ 78,831
Restructuring costs	28,041
Cash payments	(61,401)
Non-cash charges	(11,489)
Translation	(606)
Liability as of June 30, 2020	33,376
Severance and other employee costs
Restructuring Reserve [Roll Forward]
Liability as of January 1, 2020	72,192
Restructuring costs	9,236
Cash payments	(56,303)
Non-cash charges	0
Translation	(522)
Liability as of June 30, 2020	24,603
Facility and closure costs
Restructuring Reserve [Roll Forward]
Liability as of January 1, 2020	6,639
Restructuring costs	7,316
Cash payments	(5,098)
Non-cash charges	0
Translation	(84)
Liability as of June 30, 2020	8,773
Accelerated operating lease costs
Restructuring Reserve [Roll Forward]
Liability as of January 1, 2020	0
Restructuring costs	5,496
Cash payments	0
Non-cash charges	(5,496)
Translation	0
Liability as of June 30, 2020	0
Asset impairments
Restructuring Reserve [Roll Forward]
Liability as of January 1, 2020	0
Restructuring costs	5,993
Cash payments	0
Non-cash charges	(5,993)
Translation	0
Liability as of June 30, 2020	$ 0