Stockholders' Equity Stockholder's Equity (Reclassification out of Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 1,707.9		$ 1,494.9	$ 3,353.9		$ 2,891.5
Selling, general and administrative expense	(172.1)		(140.2)	(342.9)		(276.4)
Income before income taxes	147.9		157.8	280.3		288.2
Income tax (expense) benefit	(41.4)		(44.6)	(70.2)		(75.3)
Net income	106.5		113.2	210.1		212.9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Hedging | Foreign Exchange Contract [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenue	(3.8)			(1.5)
Costs of sales	1.5			3.0
Selling, general and administrative expense				0.1
Income before income taxes	(2.3)			1.6
Income tax (expense) benefit	0.2			(0.5)
Net income	(2.1)			1.1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Pension and Other Post-retirement Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss	(7.7)	[1]		(15.7)	[1]
Amortization of prior service credit	0.1	[1]		0.3	[1]
Income before income taxes	(7.6)			(15.4)
Income tax (expense) benefit	2.7			5.4
Net income	$ (4.9)			$ (10.0)

[1] (a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 8 for additional details).