Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Derivatives, Fair Value
Liabilities	$ 2.0
Net derivative fair value assets	1.0
Net derivative fair value liabilities	11.9
Potential effect of rights of set off associated with the foreign exchange contracts	$ 2.0		$ 0.0
Foreign Exchange Contract
Derivatives, Fair Value
Number of swap and forward foreign exchange contracts outstanding | contract	49
Swaps and forward contracts maturity	90 days
Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value
Assets	$ 3.0	$ 1.9
Foreign Exchange Contract | Other current liabilities
Derivatives, Fair Value
Liabilities	$ 13.9	$ 11.5