Fair Value Measurements - Narrative (Details) (Not designated as hedging instrument, Foreign exchange forward, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Not designated as hedging instrument | Foreign exchange forward
Derivative [Line Items]
Notional amount	$ 3.0		$ 3.0		$ 12.5
Net gain (loss) on foreign currency	$ 0.1	$ (0.6)	$ 0.1	$ (0.6)