Revenue Recognition and Accounts Receivable Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Gross sales	$ 4,732.3
Chargebacks	(872.1)
Rebates, promotional programs and other sales allowances	(1,030.6)
Returns	(77.3)
Medicaid and other governmental rebates	(101.9)
Sales Revenue, Gross to net adjustments	(2,081.9)
Net sales	2,650.4	$ 2,687.4
Operating Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 2,650.4	$ 2,687.4