Financial Instruments and Risk Management (Effect of Derivative Instruments on the Condensed Consolidated Balance Sheets Fair Values of Derivative Instruments Derivatives Not Designated As Hedging Instrument) (Details) - Not Designated as Hedging Instruments - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	$ 7.2	$ 20.0
Liability derivatives, fair value	23.5	9.3
Prepaid expenses and other current assets | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	7.2	20.0
Other current liabilities | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Liability derivatives, fair value	$ 23.5	$ 9.3