Restructuring - 2017 Restructuring Initiatives (Narrative) (Details)		3 Months Ended		9 Months Ended
	Jan. 26, 2017 position	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 1,700,000	$ 1,100,000	$ 11,400,000	$ 18,500,000
January 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Expected number of positions to be eliminated | position	90
Restructuring charges		94,200,000		203,700,000
Restructuring reserve correcting adjustment			14,200,000
January 2017 Restructuring | Corporate unallocated costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					4,900,000
January 2017 Restructuring | U.S. Branded - Specialty & Established Pharmaceuticals | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					6,900,000
January 2017 Restructuring | U.S. Generic Pharmaceuticals | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					3,300,000
January 2017 Restructuring | Employee Separation, Retention, and Other Benefit Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				0
Expected restructuring costs remaining		0		0
January 2017 Restructuring | Employee Separation, Retention, and Other Benefit Related Costs | U.S. Branded - Specialty & Established Pharmaceuticals | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			0		15,100,000
January 2017 Restructuring | Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges					12,700,000
January 2017 Restructuring | Inventory Reserve
Restructuring Cost and Reserve [Line Items]
Restructuring charges					7,900,000
2017 US Generic Pharmaceuticals Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				19,120,000
2017 US Generic Pharmaceuticals Restructuring | U.S. Generic Pharmaceuticals
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		4,800,000		59,600,000
2017 US Generic Pharmaceuticals Restructuring | Employee Separation, Retention, and Other Benefit Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		2,100,000	19,500,000	9,800,000	19,500,000
2017 US Generic Pharmaceuticals Restructuring | Property, Plant and Equipment Impairment Charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			14,200,000		103,700,000
2017 US Generic Pharmaceuticals Restructuring | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			59,800,000	35,200,000	$ 59,800,000
2017 US Generic Pharmaceuticals Restructuring | Asset Impairment Charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				2,600,000
2017 US Generic Pharmaceuticals Restructuring | Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				9,341,000
Restructuring charges		2,700,000	$ 600,000	12,000,000
January 2018 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				23,792,000
January 2018 Restructuring Initiative | Corporate unallocated costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				5,200,000
January 2018 Restructuring Initiative | U.S. Generic Pharmaceuticals
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				23,800,000
January 2018 Restructuring Initiative | U.S. Generic Pharmaceuticals | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				10,800,000
January 2018 Restructuring Initiative | Employee Separation, Retention, and Other Benefit Related Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				22,100,000
Expected restructuring costs remaining		$ 0		0
January 2018 Restructuring Initiative | Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				1,705,000
Restructuring charges				$ 1,700,000