Financial Instruments and Risk Management (Derivatives Not Designated As Hedging Instruments Fair Values of Derivative Instruments) (Details) (Not Designated as Hedging Instruments, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 1,538.3	$ 1,309.4
Liability Derivatives, Fair Value	1,539.6	1,308.4
Prepaid expenses and other current assets | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	3.2	6.4
Other assets | Purchased cash convertible note hedge
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,535.1	1,303.0
Other current liabilities | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	4.5	5.4
Long-term debt | Cash conversion feature of Cash Convertible Notes
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 1,535.1	$ 1,303.0