Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) - Foreign Exchange Contract $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) contract	Dec. 31, 2014 USD ($)
Derivatives, Fair Value
Net derivative fair value assets	$ 7.7
Net derivative fair value liabilities	0.1
Potential effect of rights of set off associated with the foreign exchange contracts	$ 0.2
Number of swap and forward foreign exchange contracts outstanding | contract	31
Swaps and forward contracts maturity	90 days
Prepaid expenses and other current assets
Derivatives, Fair Value
Assets	$ 7.9	$ 12.6
Other current liabilities
Derivatives, Fair Value
Liabilities	$ 0.3	$ 7.8