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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total consolidated loss from continuing operations before income tax	$ (24,070)	$ (143,068)	$ (120,363)	$ (671,559)
Interest expense, net	136,903	131,847	404,387	385,896
Amortization of intangible assets	131,900	161,300	417,949	471,700
Inventory step-up			0	261
Asset impairment charges	4,766	142,217	258,652	613,400
Acquisition-related costs	16,025	1,288	(26,983)	13,284
Gain on extinguishment of debt	0	0	(119,828)	0
Severance costs		2,100	2,200	32,700
Accelerated depreciation				35,200
Retention bonus
Segment Reporting Information [Line Items]
Restructuring expenses	6,700
Other restructuring charges
Segment Reporting Information [Line Items]
Restructuring expenses	4,400	1,700	6,300	11,400
Inventory write-offs
Segment Reporting Information [Line Items]
Restructuring expenses		200		2,800
Contract termination
Segment Reporting Information [Line Items]
Restructuring expenses	17,500		17,500
Premium associated with extending reporting period on expiring insurance program
Segment Reporting Information [Line Items]
Restructuring expenses	14,100		14,100
Segment reconciling items
Segment Reporting Information [Line Items]
Interest expense, net	136,903	131,847	404,387	385,896
Corporate unallocated costs	37,891	49,187	124,351	144,693
Amortization of intangible assets	131,932	161,275	417,949	471,662
Inventory step-up	0	71	0	261
Upfront and milestone payments to partners	1,672	4,731	4,055	43,027
Separation benefits and other cost reduction initiatives	11,023	4,001	15,172	82,141
Certain litigation-related and other contingencies, net	(14,414)	(1,750)	(4,093)	15,370
Asset impairment charges	4,766	142,217	258,652	613,400
Acquisition-related costs	16,025	1,288	(26,983)	13,284
Gain on extinguishment of debt	0	0	(119,828)	0
Foreign currency impact related to the remeasurement of intercompany debt instruments	(922)	1,528	2,874	(1,560)
Other, net	29,556	(175)	27,380	(28,348)
Operating segments
Segment Reporting Information [Line Items]
Total segment adjusted income from continuing operations before income tax	$ 330,362	$ 351,152	$ 983,553	$ 1,068,267