Revenue Recognition and Accounts Receivable Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Gross sales	$ 4,861.4		$ 14,419.0
Chargebacks	(835.7)		(2,524.2)
Rebates, promotional programs and other sales allowances	(1,025.6)		(3,144.2)
Returns	(59.4)		(160.5)
Medicaid and other governmental rebates	(113.4)		(356.9)
Sales Revenue, Gross to net adjustments	2,034.1		6,185.8
Net sales	$ 2,827.3	$ 2,956.3	$ 8,233.2	$ 8,570.2