Revenue Recognition and Accounts Receivable Variable Consideration (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Gross sales	$ 4,986.4	$ 5,051.5	$ 13,868.0	$ 13,841.0
Chargebacks	(967.0)	(913.5)	(2,616.9)	(2,368.8)
Rebates, promotional programs and other sales allowances	(926.3)	(979.2)	(2,592.3)	(2,709.9)
Returns	(76.6)	(82.3)	(193.2)	(203.3)
Medicaid and other governmental rebates	(68.4)	(148.3)	(233.4)	(352.0)
Sales Revenue, Gross to net adjustments	(2,038.3)	(2,123.3)	(5,635.8)	(5,634.0)
Net sales	$ 2,948.1	$ 2,928.2	$ 8,232.2	$ 8,207.0