Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 146.9	$ 188.6
Cash flow hedges [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	125.6	116.8
Non-designated derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 21.3	$ 71.8