Restructuring - 2017 Restructuring Initiatives (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 4.4		$ 1.7	$ 6.3	$ 11.4
2017 US generic pharmaceuticals restructuring | Generic Pharmaceuticals
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			4.8		59.6
2017 US generic pharmaceuticals restructuring | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					35.2
2017 US generic pharmaceuticals restructuring | Employee separation, retention, and other benefit related costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			2.1		9.8
2017 US generic pharmaceuticals restructuring | Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 2.7		12.0
2017 US generic pharmaceuticals restructuring | Property, plant and equipment impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					$ 2.6
Huntsville, Alabama manufacturing and distributing facility | Disposal group, disposed of by sale, not discontinued operations | 2017 US generic pharmaceuticals restructuring | Facility closing
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of property, plant and equipment		$ 23.1
Net gain on disposal		$ 12.5