Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) (Foreign Exchange Contract, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 contract	Dec. 31, 2013
Derivatives, Fair Value
Net derivative fair value assets	$ 8.4
Net derivative fair value liabilities	3.6
Potential effect of rights of set off associated with the foreign exchange contracts	4.2
Number of swap and forward foreign exchange contracts outstanding	56
Swaps and forward contracts maturity	90 days
Prepaid expenses and other current assets
Derivatives, Fair Value
Assets	12.6	4.0
Other current liabilities
Derivatives, Fair Value
Liabilities	$ 7.8	$ 2.8