Accumulated Other Comprehensive Loss - Components of 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance					$ (208.2)
Currency translation adjustment, net of tax	(3.9)	[1]	1.0	[1]	(4.7)	[1]	2.2	[1]
Amortization of pension related costs, net of tax	1.9	[2],[3]	1.9	[2],[3]	3.8	[2],[3]	5.7	[2],[3]
Other comprehensive (loss) income	(2.0)		2.9		(0.9)	[4]	7.9
Ending Balance	(209.1)				(209.1)
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance					23.3
Currency translation adjustment, net of tax					(4.7)
Amortization of pension related costs, net of tax					0
Other comprehensive (loss) income					(4.7)
Ending Balance	18.6				18.6
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					3.8
Other comprehensive (loss) income					3.8
Ending Balance	$ (227.7)				$ (227.7)

[1] Net of tax expense of $2.0 million and $2.1 million for the three months ended June 30, 2013 and 2012, respectively, and $2.3 million and $1.4 million for the six months ended June 30, 2013 and 2012, respectively.

[2] Net of tax benefit of $(0.4) million and $(0.2) million for the three months ended June 30, 2013 and 2012, respectively, and $(0.7) million and $(0.5) million for the six months ended June 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 loss during the first six months of 2013.