Accumulated Other Comprehensive Income (Reclassification Out AOCI) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									$ (310.6)	$ (176.1)	$ (91.6)
Income tax benefit	$ (184.5)	$ (14.2)	$ (114.6)	$ (108.2)	$ (96.9)	$ (69.0)	$ (109.0)	$ (52.6)	(421.5)	(327.5)	(215.5)
Total reclassification, net of tax	$ 561.0	$ (34.1)	$ 356.2	$ 718.9	$ 613.9	$ 508.5	$ 597.8	$ 279.7	1,602.0	1,999.9	1,449.9
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, net of tax									335.7	21.3	9.1
Reclassification out of accumulated other comprehensive income | Gains (losses) from cash-flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit									2.2	1.7	6.9
Reclassification out of accumulated other comprehensive income | Gains (losses) from cash-flow hedges: | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net product sales									354.4	27.5	10.7
Reclassification out of accumulated other comprehensive income | Gains (losses) from cash-flow hedges: | Treasury rate lock agreements
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									(4.2)	(3.5)	(3.4)
Reclassification out of accumulated other comprehensive income | Gains (losses) from cash-flow hedges: | Interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									(1.5)	(0.9)	0.0
Reclassification out of accumulated other comprehensive income | Gains (losses) from available-for-sale marketable securities:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit									8.2	1.9	2.2
Interest and investment income, net									$ (23.4)	$ (5.4)	$ (7.3)