Accumulated Other Comprehensive Loss - Components of 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance					$ (208.2)
Currency translation adjustment, net of tax	1.1	[1]	(1.9)	[1]	(3.6)	[1]	0.3	[1]
Amortization of pension related costs, net of tax	2.0	[2],[3]	1.8	[2],[3]	5.8	[2],[3]	7.5	[2],[3]
Other comprehensive (loss) income	3.1		(0.1)		2.2	[4]	7.8
Ending Balance	(206.0)				(206.0)
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance					23.3
Currency translation adjustment, net of tax					(3.6)
Amortization of pension related costs, net of tax					0
Other comprehensive (loss) income					(3.6)
Ending Balance	19.7				19.7
Actuarial Loss Gain On Post Retirement Benefits [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance					(231.5)
Currency translation adjustment, net of tax					0
Amortization of pension related costs, net of tax					5.8
Other comprehensive (loss) income					5.8
Ending Balance	$ (225.7)				$ (225.7)

[1] Net of tax expense (benefit) of $0.9 million and $(0.7) million for the three months ended September 30, 2013 and 2012, respectively, and $3.2 million and $0.7 million for the nine months ended September 30, 2013 and 2012, respectively.

[2] Net of tax benefit of $(0.2) million for the three months ended September 30, 2013 and 2012 and $(0.9) million and $(0.7) million for the nine months ended September 30, 2013 and 2012, respectively.

[3] This other comprehensive income component is included in the computation of net periodic benefit (income) costs. See Note 2, “Pension and Post-Retirement Benefits,” for additional information regarding net periodic benefit (income) costs.

[4] See Note 8, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive income during the first nine months of 2013.