Derivative Instruments and Hedging Activities (Foreign Currency Option Contracts) (Details) - Foreign exchange contracts - Designated as hedging instruments - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Purchased Put
Derivative [Line Items]
Notional Amount	$ 782.3	$ 641.5
Written Call
Derivative [Line Items]
Notional Amount	$ 851.5	$ 690.0