Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,604.0	$ 1,358.8	$ 1,171.3
Unrealized gains (losses) on derivative contracts
Gains arising during the period	38.7	26.1	53.2
Tax effect	(10.8)	(6.1)	(16.3)
Reclassification adjustment	(29.3)	(23.5)	(35.6)
Tax effect	8.5	5.1	10.8
Net current period OCI, unrealized gains and (losses) on derivative contracts	7.1	1.6	12.1
Unrealized (losses) gains on marketable debt securities
Net holding (loss) gain	(2.3)	5.5	(8.3)
Tax effect	0.6	(1.3)	2.2
Reclassification adjustment	(2.1)	(0.9)	1.7
Tax effect	0.6	0.3	(0.5)
Net current period OCI, unrealized gains and (losses) on marketable debt securities	(3.2)	3.6	(4.9)
Pension plans
Gains (losses) arising during the period	17.7	(291.1)	324.9
Tax effect	(2.6)	105.3	(120.1)
Reclassification adjustment	42.4	22.0	45.3
Tax effect	(14.8)	(7.1)	(15.8)
Net current period OCI, pension plans	42.7	(170.9)	234.3
Foreign currency translation losses	(483.8)	(422.8)	(73.3)
Net other comprehensive (loss) income	(437.2)	(588.5)	168.2
Comprehensive Income	$ 1,166.8	$ 770.3	$ 1,339.5