Accumulated Other Comprehensive Income (Loss) (Reclassification of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss)
Net product sales	$ 2,744.5	$ 2,254.1	$ 5,239.2	$ 4,309.3
Interest (expense)	(123.3)	(48.3)	(245.2)	(97.5)
Income tax benefit	(96.9)	(114.6)	(217.8)	(222.8)
Interest and investment income, net	7.2	8.8	14.0	17.8
Gains (Losses) Reclassified Out of Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss)
Net income	40.9	88.6	121.5	158.7
Gains (Losses) Reclassified Out of Accumulated Other Comprehensive Income | Gains (losses) from cash-flow hedges: | Foreign exchange contracts
Other Comprehensive Income (Loss)
Net product sales	61.6	90.2	150.0	160.7
Gains (Losses) Reclassified Out of Accumulated Other Comprehensive Income | Gains (losses) from cash-flow hedges: | Treasury rate lock agreements
Other Comprehensive Income (Loss)
Interest (expense)	(1.3)	(0.9)	(2.6)	(1.8)
Gains (Losses) Reclassified Out of Accumulated Other Comprehensive Income | Gains (losses) from cash-flow hedges: | Interest rate swap agreements
Other Comprehensive Income (Loss)
Interest (expense)	(0.4)	(0.3)	(0.8)	(0.7)
Income tax benefit	0.6	0.5	1.3	1.0
Gains (Losses) Reclassified Out of Accumulated Other Comprehensive Income | Gains (losses) from available-for-sale marketable securities:
Other Comprehensive Income (Loss)
Income tax benefit	10.5	0.4	14.1	0.2
Interest and investment income, net	$ (30.1)	$ (1.3)	$ (40.5)	$ (0.7)