Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 1,358.8	$ 1,171.3	$ 1,111.6
Unrealized gains (losses) on derivative contracts
Gains (losses) arising during the period	26.1	53.2	(29.2)
Tax effect	(6.1)	(16.3)	9.1
Reclassification adjustment	(23.5)	(35.6)	22.7
Tax effect	5.1	10.8	(7.8)
Net current period OCI, unrealized gains and (losses) on derivative contracts	1.6	12.1	(5.2)
Unrealized gains (losses) on marketable debt securities
Net holding gain (loss)	5.5	(8.3)	2.7
Tax effect	(1.3)	2.2	(0.6)
Reclassification adjustment	(0.9)	1.7	(2.9)
Tax effect	0.3	(0.5)	0.8
Net current period OCI, unrealized gains and (losses) on marketable debt securities	3.6	(4.9)
Pension plans
(Losses) gains arising during the period	(291.1)	324.9	(71.0)
Tax effect	105.3	(120.1)	22.4
Reclassification adjustment	22.0	45.3	45.4
Tax effect	(7.1)	(15.8)	(15.2)
Net current period OCI, pension plans	(170.9)	234.3	(18.4)
Foreign currency translation (losses) gains	(422.8)	(73.3)	83.1
Net other comprehensive (loss) income	(588.5)	168.2	59.5
Comprehensive Income	$ 770.3	$ 1,339.5	$ 1,171.1