Restructuring and Other Charges - Restructuring and Asset-related Costs and Charges By Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	$ 2,398	$ 34,345	$ 56,413
Operating Segments | Generics
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	(614)	20,101	33,943
Corporate
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	3,012	13,853	18,394
Severance charges
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	(119)	11,121	45,118
Other employee severance charges	3,053	10,765	0
Asset-related charges
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	(536)	12,459	11,295
Employee and asset-related restructuring charges
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	(655)	23,580	56,413
Employee and asset-related restructuring charges | Operating Segments | Generics
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	(655)	20,101	33,943
Employee and asset-related restructuring charges | Operating Segments | Specialty
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	0	391	4,076
Employee and asset-related restructuring charges | Corporate
Restructuring Cost and Reserve [Line Items]
Employee restructuring separation charges	$ 0	$ 3,088	$ 18,394