Restructuring - 2017 Restructuring Initiatives (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 0.2	$ 4.3
2017 US generic pharmaceuticals restructuring | Generic Pharmaceuticals
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			27.7
2017 US generic pharmaceuticals restructuring | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			17.1
2017 US generic pharmaceuticals restructuring | Employee separation, retention, and other benefit related costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			3.8
2017 US generic pharmaceuticals restructuring | Property, plant and equipment impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			2.6
2017 US generic pharmaceuticals restructuring | Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 4.2
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