Segment Results - Schedule of Reconciliations of Consolidated Adjusted Income (Loss) Before Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total consolidated loss from continuing operations before income tax	$ (64,800)	$ (24,070)	$ (18,299)	$ (120,363)
Amortization of intangible assets	104,100	131,900	325,801	417,900
Asset impairment charges	8,412	4,766	106,197	258,652
Acquisition-related costs	(1,407)	16,025	17,100	(26,983)
Gain on extinguishment of debt	0	0	0	(119,828)
Total segment adjusted income (loss) from continuing operations before income tax	308,117	344,918	1,089,584	1,033,782
Accelerated depreciation charges	6,300		14,700
Payments of debt restructuring costs			31,100
Other nonrecurring (income) expense, expired insurance premium		14,100
International Pharmaceuticals
Segment Reporting Information [Line Items]
Total segment adjusted income (loss) from continuing operations before income tax	10,679	11,511	34,180	35,053
Retention bonus
Segment Reporting Information [Line Items]
Restructuring charges	4,300	6,700	22,200	6,700
Other restructuring charges
Segment Reporting Information [Line Items]
Restructuring charges	3,400	4,300	9,800	6,300
Employee severance
Segment Reporting Information [Line Items]
Restructuring charges	53,600		53,600	2,200
Contract termination
Segment Reporting Information [Line Items]
Restructuring charges		17,500		17,500
Contract termination | International Pharmaceuticals
Segment Reporting Information [Line Items]
Restructuring charges		17,500		17,500
Premium on an expiring insurance program
Segment Reporting Information [Line Items]
Restructuring charges				14,100
Segment reconciling items
Segment Reporting Information [Line Items]
Interest expense, net	135,648	136,903	397,689	404,387
Corporate unallocated costs	39,976	37,891	116,888	124,351
Amortization of intangible assets	104,066	131,932	325,801	417,949
Upfront and milestone payments to partners	275	1,672	2,469	4,055
Continuity and separation benefits and other cost reduction initiatives	67,692	11,023	100,356	15,172
Certain litigation-related and other contingencies, net	1,810	(14,414)	(23,938)	(4,093)
Certain legal costs	18,343	14,556	51,884	50,229
Asset impairment charges	8,412	4,766	106,197	258,652
Acquisition-related costs	(1,407)	16,025	17,100	(26,983)
Gain on extinguishment of debt	0	0	0	(119,828)
Foreign currency impact related to the remeasurement of intercompany debt instruments	1,663	(922)	(2,426)	2,874
Other, net	(3,561)	29,556	15,863	27,380
Operating segments
Segment Reporting Information [Line Items]
Total segment adjusted income (loss) from continuing operations before income tax	$ 308,117	$ 344,918	$ 1,089,584	$ 1,033,782