Stockholders' Equity (Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Foreign Currency Translation
Beginning balance	$ (104.6)
Other comprehensive income (loss) before reclassifications, net of tax	(29.1)	[1]	23.6	[1]
Net current-period other comprehensive income (loss), net of tax	(29.1)	[1]
Ending Balance	(133.7)
Hedging
Beginning Balance	10.0
Other comprehensive income (loss) before reclassifications, net of tax	(21.1)		13.4
Reclassification adjustment for net (gains) losses included in net income, net of tax	(3.2)
Net current-period other comprehensive income (loss), net of tax	(24.3)	[2]	12.3	[2]
Ending Balance	(14.3)
Defined Pension and Other Post-retirement Benefits
Beginning Balance	(301.4)
Reclassification adjustment for net (gains) losses included in net income, net of tax	5.1
Net current-period other comprehensive income (loss), net of tax	5.1	[3]	4.6	[3]
Ending Balance	(296.3)
Accumulated other comprehensive loss, beginning balance	(396.0)
Other comprehensive income (loss) before reclassifications, net of tax	(50.2)
Reclassification adjustment for net (gains) losses included in net income, net of tax	(1.9)
Net current-period other comprehensive income (loss), net of tax	(48.3)		40.5
Accumulated other comprehensive loss, ending balance	$ (444.3)

[1] Net of income tax (expense) benefit of $2.5 and $(0.4) for the three months ended March 31, 2013 and 2012, respectively.

[2] Net of income tax (expense) benefit of $5.6 and $(6.8) for the three months ended March 31, 2013 and 2012, respectively.

[3] Net of income tax (expense) benefit of $(2.7) and $(2.4) for the three months ended March 31, 2013 and 2012, respectively.