Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,137.3	$ 1,033.9	$ 925.1
Provision charged to income	2,958.8	2,287.9	2,036.7
Additions through acquisitions	185.8	0.0	0.0
Costs incurred/ utilization	(2,660.9)	(2,184.5)	(1,927.9)
Ending balance	1,621.0	1,137.3	1,033.9
Accrued rebates - Medicaid and HMOs
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	982.4	882.1	806.5
Provision charged to income	2,702.4	2,128.0	1,877.7
Additions through acquisitions	185.8	0.0	0.0
Costs incurred/ utilization	(2,439.3)	(2,027.7)	(1,802.1)
Ending balance	1,431.3	982.4	882.1
Sales returns reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	128.3	131.7	97.9
Provision charged to income	19.5	19.4	60.1
Additions through acquisitions	0.0	0.0	0.0
Costs incurred/ utilization	(29.4)	(22.8)	(26.3)
Ending balance	118.4	128.3	131.7
Accrued coupons
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	26.6	20.1	20.7
Provision charged to income	236.9	140.5	98.9
Additions through acquisitions	0.0	0.0	0.0
Costs incurred/ utilization	(192.2)	(134.0)	(99.5)
Ending balance	$ 71.3	$ 26.6	$ 20.1