Consolidated Statement of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Comprehensive Income
Net income	$ 1,894.4	$ 1,273.3	$ 1,177.9
Other Comprehensive Items:
Currency translation adjustment	(1,182.6)	24.6	293.7
Unrealized gains on available-for-sale investments:
Unrealized holding gains arising during the period (net of tax provision of $0.1, $0.5 and $0.1)	1.7	1.6	0.7
Reclassification adjustment for gains included in net income (net of tax provision of $0.2 and $2.5)	(1.7)	(8.0)	0
Unrealized gains and losses on hedging instruments:
Unrealized gain on hedging instruments (net of tax provision of $3.6)	0	5.8	0
Reclassification adjustment for losses included in net income (net of tax benefit of $1.8, $2.2 and $2.0)	3.0	3.2	3.3
Pension and other postretirement benefit liability adjustment:
Pension and other postretirement benefit liability adjustments arising during the period (net of tax provision (benefit) of ($26.5), $20.3 and ($20.8))	(52.2)	38.2	(53.0)
Amortization of net loss and prior service benefit included in net periodic pension cost (net of tax benefit of $13.3, $3.6 and $2.4)	24.0	7.8	4.4
Total other comprehensive items	(1,207.8)	73.2	249.1
Comprehensive Income	$ 686.6	$ 1,346.5	$ 1,427.0