Stockholders' Equity (Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			$ (53.0)
Reclassification adjustment for net (gains) losses included in net income, net of tax			13.3
Other comprehensive income (loss), net of tax	36.6	52.3	(39.7)		34.0
Accumulated other comprehensive income (loss), net of tax	(435.7)		(435.7)			(396.0)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			(70.1)
Other comprehensive income (loss), net of tax			(70.1)	[1]
Accumulated other comprehensive income (loss), net of tax	(174.7)		(174.7)			(104.6)
Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, net of tax			17.1
Reclassification adjustment for net (gains) losses included in net income, net of tax			(1.7)
Other comprehensive income (loss), net of tax			15.4	[2]
Accumulated other comprehensive income (loss), net of tax	25.4		25.4			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			15.0
Other comprehensive income (loss), net of tax			15.0	[3]
Accumulated other comprehensive income (loss), net of tax	$ (286.4)		$ (286.4)			$ (301.4)

[1] Net of income tax (expense) benefit of $(0.8) and $(1.0) for the three months ended September 30, 2013 and 2012, respectively, and $1.2 and $(0.1) for the nine months ended September 30, 2013 and 2012, respectively.

[2] Net of income tax (expense) benefit of $(11.2) and $(8.0) for the three months ended September 30, 2013 and 2012, respectively, and $2.8 and $(12.2) for the nine months ended September 30, 2013 and 2012, respectively.

[3] Net of income tax (expense) benefit of $(2.7) and $(6.1) for the three months ended September 30, 2013 and 2012, respectively, and $(8.1) and $(11.3) for the nine months ended September 30, 2013 and 2012, respectively.