Collaborative and Other Relationships - AbbVie (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Collaborative arrangements and non-collaborative arrangement transactions
Product Revenues	$ 3,526.3	$ 3,439.0	$ 3,356.5	$ 3,131.1	$ 3,307.0	$ 3,077.8	$ 3,078.4	$ 2,810.7	$ 13,452.9	$ 12,273.9	$ 11,448.8
Costs and expenses									7,564.3	6,928.1	6,297.1
AbbVie
Collaborative arrangements and non-collaborative arrangement transactions
Co-promotion profits and losses									17.8	39.5	43.9
U.S | AbbVie
Collaborative arrangements and non-collaborative arrangement transactions
Product Revenues									(8.6)	(16.9)	(21.9)
Costs and expenses									25.3	92.6	50.0
Product, net
Collaborative arrangements and non-collaborative arrangement transactions
Product Revenues	$ 2,825.7	$ 2,780.1	$ 2,757.5	$ 2,523.5	$ 2,712.4	$ 2,622.5	$ 2,639.7	$ 2,380.1	10,886.8	10,354.7	9,817.9
Product, net | U.S
Collaborative arrangements and non-collaborative arrangement transactions
Product Revenues									6,800.5	7,017.1	7,050.4
Product, net | U.S | AbbVie
Collaborative arrangements and non-collaborative arrangement transactions
Product Revenues									$ 7.5	$ 53.1	$ 6.1