Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (149.8)
Unrealized gains (losses), net of tax	1.6	[1]	(0.8)	[1]
Amortization of pension related costs, net of tax	1.2	[2],[3],[4]	1.9	[2],[3]
Revaluation of derivative financial instruments, net of tax	(1.0)	[5],[6]	0	[5]
Other Comprehensive Income (Loss), Net of Tax	1.8	[7]	1.1
Ending Balance	(148.0)
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	19.2
Unrealized gains (losses), net of tax	1.6
Amortization of pension related costs, net of tax	0	[4]
Revaluation of derivative financial instruments, net of tax	0	[6]
Other Comprehensive Income (Loss), Net of Tax	1.6
Ending Balance	20.8
Actuarial (Loss) Gain on Post-retirement Benefits
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(170.5)
Unrealized gains (losses), net of tax	0
Amortization of pension related costs, net of tax	1.2	[4]
Revaluation of derivative financial instruments, net of tax	0	[6]
Other Comprehensive Income (Loss), Net of Tax	1.2
Ending Balance	(169.3)
Deferred Gain - Hedging
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1.5
Unrealized gains (losses), net of tax	0
Amortization of pension related costs, net of tax	0	[4]
Revaluation of derivative financial instruments, net of tax	(1.0)	[6]
Other Comprehensive Income (Loss), Net of Tax	(1.0)
Ending Balance	$ 0.5

[1] Net of tax (benefit) expense of $(0.5) million and $0.3 million for the three months ended March 31, 2014 and 2013, respectively.

[2] Net of tax benefit of nil and $(0.3) million for the three months ended March 31, 2014 and 2013, respectively.

[3] This other comprehensive income component is included in the computation of net periodic benefit (income) costs. See Note 5, “Pension and Post-Retirement Benefits,” for additional information regarding net periodic benefit (income) costs.

[4] Amount represents the change in accumulated other comprehensive loss as a result of the amortization of unrecognized prior service costs and actuarial losses (gains) arising during each year related to the Company’s pension and other post-retirement plans. See Note 5, “Pension and Post-retirement Benefits,” for further discussion of the Company’s pension and other post-retirement plans.

[5] Net of tax expense of $0.6 million for the three months ended March 31, 2014.

[6] For the three months ended March 31, 2014, the 2013 Interest Rate Swap (as hereinafter defined) was deemed effective and therefore the changes in fair value related to the 2013 Interest Rate Swap are recorded in other comprehensive income. See Note 14, "Financial Instruments," for further discussion of the 2013 Interest Rate Swap.

[7] See Note 12, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive income during the three months ended March 31, 2014.