Revenue Recognition and Accounts Receivable Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Gross sales	$ 4,457.6	$ 4,631.0	$ 8,881.6	$ 8,789.5
Chargebacks	(795.5)	(751.6)	(1,649.9)	(1,455.3)
Rebates, promotional programs and other sales allowances	(820.4)	(874.5)	(1,666.0)	(1,730.7)
Returns	(57.6)	(75.2)	(116.6)	(121.0)
Medicaid and other governmental rebates	(88.2)	(111.5)	(165.0)	(203.7)
Sales Revenue, Gross to net adjustments	(1,761.7)	(1,812.8)	(3,597.5)	(3,510.7)
Net sales	$ 2,695.9	$ 2,818.2	$ 5,284.1	$ 5,278.8