Stockholders' Equity Reclassification Out of Accumulated Other Comprehensive Income (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]
Revenue	$ 2,156.2	$ 1,976.7	$ 1,985.3	$ 1,824.4	$ 2,047.8	$ 1,724.5	$ 1,707.9	$ 1,646.0	$ 7,942.6		$ 7,126.2		$ 6,151.4
Costs of sales	(1,608.9)	(1,479.6)	(1,507.8)	(1,403.5)	(1,560.3)	(1,353.8)	(1,350.1)	(1,307.2)
Selling, general and administrative expense									(750.6)		(694.8)		(596.9)
Income before income taxes									1,066.3		719.2		601.2
Income tax (expense) benefit									(361.0)		(212.6)		(166.4)
Net income	170.6	170.5	227.7	136.5	179.1	117.4	106.5	103.6	705.3		506.6		434.8
Defined Pension and Other Post-retirement Benefits | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes									(43.7)		(36.2)
Income tax (expense) benefit									15.5		15.2
Net income									(28.2)		(21.0)
Settlements and curtailments									(24.9)	[1]	(5.1)	[1]
Amortization of actuarial loss									(18.6)	[1]	(31.7)	[1]
Amortization of prior service credit									(0.3)	[1]	0.5	[1]
Amortization of transition asset									0.1	[1]	0.1	[1]
Foreign Exchange Contract | Hedging | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue									(36.2)		(11.7)
Costs of sales									34.2		14.8
Selling, general and administrative expense									(0.2)
Income before income taxes									(2.2)		3.1
Income tax (expense) benefit									3.0		2.1
Net income									$ 0.8		$ 5.2

[1] (a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).