Product Sales - Schedule of Sales Related Deductions Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 85.3	$ 45.8	$ 55.3
Provisions	478.9	408.3	278.2
Credits/payments	(472.8)	(368.8)	(287.7)
Ending Balance	91.4	85.3	45.8
Rebates, Chargebacks, and Discounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	29.9	12.7	6.4
Provisions	223.4	167.8	93.4
Credits/payments	(212.2)	(150.6)	(87.1)
Ending Balance	41.1	29.9	12.7
Distribution- Related Fees
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	34.1	29.5	48.4
Provisions	211.0	194.1	154.4
Credits/payments	(203.1)	(189.5)	(173.3)
Ending Balance	42.0	34.1	29.5
Other Sales- Related Deductions
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	21.3	3.6	0.5
Provisions	44.5	46.4	30.4
Credits/payments	(57.5)	(28.7)	(27.3)
Ending Balance	$ 8.3	$ 21.3	$ 3.6