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Accumulated Other Comprehensive Income (Reclassification Out AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									$ (176.1)us-gaap_InterestExpense	$ (91.6)us-gaap_InterestExpense	$ (63.2)us-gaap_InterestExpense
Income tax benefit (expense)	(96.9)us-gaap_IncomeTaxExpenseBenefit	(69.0)us-gaap_IncomeTaxExpenseBenefit	(109.0)us-gaap_IncomeTaxExpenseBenefit	(52.6)us-gaap_IncomeTaxExpenseBenefit	(2.8)us-gaap_IncomeTaxExpenseBenefit	(69.5)us-gaap_IncomeTaxExpenseBenefit	(79.7)us-gaap_IncomeTaxExpenseBenefit	(63.5)us-gaap_IncomeTaxExpenseBenefit	(327.5)us-gaap_IncomeTaxExpenseBenefit	(215.5)us-gaap_IncomeTaxExpenseBenefit	(225.3)us-gaap_IncomeTaxExpenseBenefit
Total reclassification, net of tax	613.9us-gaap_NetIncomeLoss	508.5us-gaap_NetIncomeLoss	597.8us-gaap_NetIncomeLoss	279.7us-gaap_NetIncomeLoss	214.4us-gaap_NetIncomeLoss	372.5us-gaap_NetIncomeLoss	478.1us-gaap_NetIncomeLoss	384.9us-gaap_NetIncomeLoss	1,999.9us-gaap_NetIncomeLoss	1,449.9us-gaap_NetIncomeLoss	1,456.2us-gaap_NetIncomeLoss
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, net of tax									21.3	9.1	76.7
Gains (losses) from cash-flow hedges: \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)									1.7	6.9	(1.9)
Gains (losses) from available-for-sale marketable securities: \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)									1.9	2.2	0.1
Interest and investment income, net									(5.4)	(7.3)	(1.1)
Foreign exchange contracts \| Gains (losses) from cash-flow hedges: \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net product sales									27.5	10.7	80.9
Treasury rate locks \| Gains (losses) from cash-flow hedges: \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									(3.5)	(3.4)	(1.3)
Interest rate swap contracts \| Gains (losses) from cash-flow hedges: \| Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest (expense)									$ (0.9)	$ 0	$ 0