Geographic and Product Information (Revenue by Product) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues by Product
Total net product sales									$ 9,161.1	$ 7,563.8	$ 6,362.3
Other revenue									94.9	106.6	131.6
Total revenue	$ 2,563.3	$ 2,334.1	$ 2,277.8	$ 2,080.8	$ 2,085.5	$ 1,982.2	$ 1,872.7	$ 1,730.0	9,256.0	7,670.4	6,493.9
REVLIMID
Revenues by Product
Total net product sales									5,801.1	4,980.0	4,280.3
ABRAXANE
Revenues by Product
Total net product sales									967.5	848.2	648.9
POMALYST/IMNOVID
Revenues by Product
Total net product sales									983.3	679.7	305.4
OTEZLA
Revenues by Product
Total net product sales									471.7	69.8	0.0
VIDAZA
Revenues by Product
Total net product sales									590.7	611.9	803.3
Azacitidine
Revenues by Product
Total net product sales									83.9	78.2	23.3
THALOMID
Revenues by Product
Total net product sales									185.4	221.2	244.5
ISTODAX
Revenues by Product
Total net product sales									69.1	65.6	54.0
Other
Revenues by Product
Total net product sales									$ 8.4	$ 9.2	$ 2.6