Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Deferred gains (losses) on derivative instruments expected to be reclassified into earnings during the next 12 months	$ (0.7)		$ (0.7)
Foreign Currency Forward [Member]
Derivative [Line Items]
Notional amounts	18.3		$ 18.3		$ 29.3
Remaining maturity of outstanding instruments			10 months
Foreign Currency Forward [Member] | Not Designated as Hedging Instrument [Member] | Foreign Currency Gain (Loss) [Member]
Derivative [Line Items]
Gain (loss) related to changes in fair value of derivative instruments	0.2	$ 0.2	$ 0.1	$ 0.3
Foreign Currency Forward [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Gain (loss) on settlement of derivative instruments	$ (0.8)	$ (0.6)	$ (2.9)	$ (2.4)
Foreign Currency Forward [Member] | Cash Flow Hedging [Member] | Other current liabilities [Member]
Derivative [Line Items]
Foreign currency forward contracts - liability position					$ 3.1