Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 521.7	$ 1,604.0	$ 1,358.8
Unrealized (losses) gains on derivative contracts
Net (loss) gain arising during the period	(6.5)	38.7	26.1
Tax effect	6.7	(10.8)	(6.1)
Reclassification adjustment	10.8	(29.3)	(23.5)
Tax effect	(8.9)	8.5	5.1
Net current period OCI, unrealized gains and (losses) on derivative contracts	2.1	7.1	1.6
Unrealized (losses) gains on marketable debt securities
Net holding (loss) gain	(0.1)	(2.3)	5.5
Tax effect	0.4	0.6	(1.3)
Reclassification adjustment	(3.7)	(2.1)	(0.9)
Tax effect	1.0	0.6	0.3
Net current period OCI, unrealized gains and (losses) on marketable debt securities	(2.4)	(3.2)	3.6
Pension plans
Net (loss) gain arising during the period	(50.3)	17.7	(291.1)
Tax effect	7.7	(2.6)	105.3
Reclassification adjustment	28.9	42.4	22.0
Tax effect	(10.0)	(14.8)	(7.1)
Net current period OCI, pension plans	(23.7)	42.7	(170.9)
Foreign currency translation loss	(87.1)	(483.8)	(422.8)
Net other comprehensive loss	(111.1)	(437.2)	(588.5)
Comprehensive Income	$ 410.6	$ 1,166.8	$ 770.3