Financial Instruments and Risk Management (Effect Of Derivative Instruments on the Condensed Consolidated Statements of Operations, Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives	$ (15.0)	$ 0.1
Foreign currency forward contracts | Other expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives	(15.0)
Foreign currency forward contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives		0.1
Cash conversion feature of Cash Convertible Notes | Other expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives		(127.7)
Cash conversion feature of Cash Convertible Notes | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives	0.0
Purchased cash convertible note hedge | Other expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives	$ 0.0
Purchased cash convertible note hedge | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in Earnings on Derivatives		$ 127.7