Foreign Exchange - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Foreign Currency [Abstract]
Net foreign exchange transaction gains (losses)	$ (1.2)	$ (0.8)	$ 51.8	$ (2.1)