Debt (Summary of Cash Convertible Notes) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Sep. 15, 2008
Debt Instrument [Line Items]
Notes and Loans Payable, Current	$ 1,933.5		$ 0
Net debt carrying amount (a)	7,657.0		7,586.5
Cash Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Outstanding principal	574.0		574.0		575.0
Equity component carrying amount	1,387.9		1,303.3
Unamortized discount	(28.5)		(49.0)
Notes and Loans Payable, Current	1,933.4	[1]
Net debt carrying amount (a)			1,828.3	[1]
Cash Convertible Notes | Call Options
Debt Instrument [Line Items]
Purchased call options (b)	$ 1,387.9	[2]	$ 1,303.3	[2]

[1] As of September 30, 2014 and December 31, 2013, the cash convertible notes were classified as current portion of long-term debt and other long-term obligations and long-term debt, respectively, on the Consolidated Balance Sheets.

[2] As of September 30, 2014 and December 31, 2013, purchased call options were classified as prepaid expenses and other current assets and other assets, respectively, on the Consolidated Balance Sheets.