Stockholders' Equity (Accumulated Other Comprehensive Loss) (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	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			$ (85.2)
Reclassification adjustment for net (gains) losses included in net income, net of tax			8.9
Net current-period other comprehensive income (loss), net of tax	(28.0)	(58.8)	(76.3)		(18.3)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(472.3)		(472.3)			(396.0)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			(79.0)
Net current-period other comprehensive income (loss), net of tax			(79.0)	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(183.6)		(183.6)			(104.6)
Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			(6.2)
Reclassification adjustment for net (gains) losses included in net income, net of tax			(1.1)
Net current-period other comprehensive income (loss), net of tax			(7.3)	[2]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2.7		2.7			10.0
Defined Pension and Other Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for net (gains) losses included in net income, net of tax			10.0
Net current-period other comprehensive income (loss), net of tax			10.0	[3]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (291.4)		$ (291.4)			$ (301.4)

[1] Net of income tax (expense) benefit of $(0.5) and $1.3 for the three months ended June 30, 2013 and 2012, respectively, and $2.0 and $0.9 for the six months ended June 30, 2013 and 2012, respectively.

[2] Net of income tax (expense) benefit of $8.4 and $2.6 for the three months ended June 30, 2013 and 2012, respectively, and $14.0 and $(4.2) for the six months ended June 30, 2013 and 2012, respectively.

[3] Net of income tax (expense) benefit of $(2.7) and $(2.8) for the three months ended June 30, 2013 and 2012, respectively, and $(5.4) and $(5.2) for the six months ended June 30, 2013 and 2012, respectively.