Debt (Summary of Cash Convertible Notes) (Details) - USD ($) $ in Millions		Dec. 31, 2015		Dec. 31, 2014		Dec. 24, 2013	Sep. 15, 2008
Debt Instrument [Line Items]
Outstanding principal						$ 750.0
Long-term debt, current maturities		$ 998.7		$ 2,404.2
Cash Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Outstanding principal				573.1			$ 575.0
Equity component carrying amount				1,853.5
Unamortized discount				(21.0)
Long-term debt, current maturities		$ 0.0	[1]	2,405.6	[2]
Purchased call options	[3]			$ 1,853.5

[1] The Cash Convertible Notes matured on September 15, 2015 and the remaining amount outstanding was repaid in full by the Company utilizing proceeds from the Delayed Draw Loan, included in 2015 Term Loans above. In addition, the convertible note hedge was settled during the third quarter of 2015.

[2] As of December 31, 2014, 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.

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