Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (243.2)
Currency translation adjustment, net of tax	(13.4)	[1]	1.6	[1]
Amortization of pension related costs, net of tax	1.7	[2],[3]	1.2	[2],[3]
Revaluation of derivative financial instruments, net of tax	(1.9)	[4]	(1.0)	[4]
Other comprehensive loss	(13.6)	[5]	1.8
Ending Balance	(256.8)
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(5.4)
Currency translation adjustment, net of tax	(13.4)
Amortization of pension related costs, net of tax
Revaluation of derivative financial instruments, net of tax
Other comprehensive loss	(13.4)
Ending Balance	(18.8)
Actuarial (Loss) Gain on Post-retirement Benefits
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(235.3)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax	1.7
Revaluation of derivative financial instruments, net of tax
Other comprehensive loss	1.7
Ending Balance	(233.6)
Deferred Gain - Hedging
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(2.2)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax
Revaluation of derivative financial instruments, net of tax	(1.9)
Other comprehensive loss	(1.9)
Ending Balance	(4.1)
Accumulated Other Comprehensive Income (Loss), Other [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(0.3)
Currency translation adjustment, net of tax
Amortization of pension related costs, net of tax
Revaluation of derivative financial instruments, net of tax
Other comprehensive loss	0
Ending Balance	$ (0.3)

[1] Net of tax (benefit) expense, of $(2.6) million and $0.5 million for the three months ended March 31, 2015 and 2014, respectively.

[2] This other comprehensive income component is included in the computation of net periodic benefit (income) costs. See Note 9, “Pension and Post-Retirement Benefits,” for additional information regarding net periodic benefit (income) costs.

[3] Net of tax benefit of $0.3 million and nil for the three months ended March 31, 2015 and 2014, respectively.

[4] Net of tax benefit of $1.2 million and $0.6 million for the three months ended March 31, 2015 and 2014, respectively.

[5] See Note 11, “Accumulated Other Comprehensive Loss,” regarding the changes in the accumulated balances for each component of other comprehensive loss during the three months ended March 31, 2015.