Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued rebates - Medicaid and HMOs
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,431.3	$ 982.4	$ 882.1
Provision charged to income	3,069.8	2,702.4	2,128.0
Additions through acquisitions	0.0	185.8	0.0
Utilization / cash payments	(2,888.4)	(2,439.3)	(2,027.7)
Ending balance	1,612.7	1,431.3	982.4
Sales returns reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	118.4	128.3	131.7
Provision charged to income	105.0	19.5	19.4
Additions through acquisitions	0.0	0.0	0.0
Utilization / cash payments	(47.7)	(29.4)	(22.8)
Ending balance	175.7	118.4	128.3
Accrued coupons
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	71.3	26.6	20.1
Provision charged to income	291.5	236.9	140.5
Additions through acquisitions	0.0	0.0	0.0
Utilization / cash payments	(310.4)	(192.2)	(134.0)
Ending balance	52.4	71.3	26.6
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	569.4	416.1	324.7
Provision charged to income	81.4	166.4	81.5
Additions through acquisitions	0.0	0.0	98.9
Utilization / cash payments	(15.1)	(13.1)	(89.0)
Ending balance	$ 635.7	$ 569.4	$ 416.1

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

+ References

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