Restructuring - January 2018 Restructuring Initiative (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Remaining liability			$ 1.1
Employee separation, retention, and other benefit related costs | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 21.9
Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.2	$ 4.3
Other restructuring charges | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1.0
Generic Pharmaceuticals | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 22.9
Operating segments | Generic Pharmaceuticals | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	10.2
Operating segments | Sterile Injectables | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3.8
Operating segments | International Pharmaceuticals | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	3.0
Operating segments | Branded Pharmaceuticals | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	0.7
Corporate unallocated costs | January 2018 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 5.2