Financial Instruments (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013
Derivative instruments
Percentage of projected intercompany purchases hedged by forward exchange contracts	50.00%
Period of projected intercompany purchase transactions	12 months
Forward exchange contracts | Purchased contracts | Minimum
Derivative instruments
Notional amount	$ 0.0
Forward exchange contracts | Purchased contracts | Maximum
Derivative instruments
Notional amount	$ 10.0
Forward exchange contracts | Non designated
Derivative instruments
Notional amount		$ 1.0