Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Forward exchange contracts and options designated as hedging instruments, assets	$ 15.4	$ 5.6
Forward exchange contracts and options designated as hedging instruments, liabilities	34.4	49.0
Other Current Assets [Member]
Forward exchange contracts and options designated as hedging instruments, assets	9.2	3.0
Other Non-Current Assets [Member]
Forward exchange contracts and options designated as hedging instruments, assets	6.0	2.3
Other Current Liabilities [Member]
Forward exchange contracts and options designated as hedging instruments, liabilities	21.7	31.3
Other Noncurrent Liabilities [Member]
Forward exchange contracts and options designated as hedging instruments, liabilities	$ 9.4	$ 15.4