Debt (Summary of Long-term Debt) (Details) - USD ($) $ in Millions			12 Months Ended
		Jul. 15, 2015	Dec. 31, 2015		Dec. 09, 2015	Dec. 31, 2014		Dec. 24, 2013	Nov. 13, 2013	Jun. 18, 2013	Nov. 09, 2010	May. 12, 2010	Sep. 15, 2008
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage											6.00%
Net debt carrying amount			$ 7,294.3			$ 8,104.1
Deferred financing fees	[1]		(38.3)			(34.4)
Long-term debt, current maturities			998.7			2,404.2
Long-term debt, excluding current maturities			6,295.6			5,699.9
Other
Debt Instrument [Line Items]
Net debt carrying amount			4.3
Loans payable | 2015 Term Loans
Debt Instrument [Line Items]
Net debt carrying amount			1,600.0			0.0
Loans payable | 2014 Term Loan
Debt Instrument [Line Items]
Net debt carrying amount			800.0			800.0
Convertible Debt | Cash Convertible Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[2]												3.75%
Long-term debt, current maturities			0.0	[2]		2,405.6	[3]
Senior Notes | 2016 Senior Notes (1.800% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[4]									1.80%
Net debt carrying amount	[4]		$ 500.1			500.2
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.20%
Senior Notes | 2016 Senior Notes (1.350% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[5]								1.35%
Net debt carrying amount	[5]		$ 499.9			499.8
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.125%
Senior Notes | 2018 Senior Notes (2.600% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[6]									2.60%
Net debt carrying amount	[6]		$ 649.3			649.0
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.30%
Senior Notes | 2018 Senior Notes (3.000% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[6]				3.00%
Net debt carrying amount			$ 499.4	[6]	$ 500.0	0.0	[6]
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.30%
Senior Notes | 2019 Senior Notes (2.550% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[7]								2.55%
Net debt carrying amount	[7]		$ 499.2			499.0
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.20%
Senior Notes | 2020 Senior Notes (3.750% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[8]				3.75%
Net debt carrying amount			$ 499.8	[8]	$ 500.0	0.0	[8]
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.35%
Senior Notes | 2020 Senior Notes (7.875% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[9]											7.875%
Net debt carrying amount	[9]		$ 0.0			1,010.5
Debt instrument, redemption price, percentage		103.938%
Senior Notes | 2023 Senior Notes (3.125% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[7]							3.125%
Net debt carrying amount	[7]		$ 785.2			779.1
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.20%
Senior Notes | 2023 Senior Notes (4.200% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[10]								4.20%
Net debt carrying amount	[10]		$ 498.4			498.2
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.25%
Senior Notes | 2043 Senior Notes (5.400% coupon)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	[10]								5.40%
Net debt carrying amount	[10]		$ 497.0			497.0
Equivalent percentage of redeemed amount			100.00%
Debt instrument, basis spread on variable rate			0.25%
Senior Notes | Other
Debt Instrument [Line Items]
Net debt carrying amount						$ 0.1

[1] The Company has elected to early adopt ASU 2015-03, as further described in Note 2 Summary of Significant Accounting Policies, as of December 31, 2015. As such, the Company has retrospectively reclassified deferred financing fees related to term debt and Senior Notes from other assets to the current portion of long-term debt and other long-term obligations or long-term debt, dependent on the respective debt instrument, on the Consolidated Balance Sheets for all periods presented. For disclosure purposes, the amount has not been allocated to the individual instruments

[2] 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.

[3] 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.

[4] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.20% plus, in each case, accrued and unpaid interest. Instrument is due on June 24, 2016 and is included in current portion of long-term debt and other long-term obligations in the Consolidated Balance Sheets at December 31, 2015.

[5] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.125% plus, in each case, accrued and unpaid interest. Instrument is due on November 29, 2016 and is included in current portion of long-term debt and other long-term obligations in the Consolidated Balance Sheets at December 31, 2015.

[6] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.30% plus, in each case, accrued and unpaid interest.

[7] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.20% plus, in each case, accrued and unpaid interest.

[8] Instrument is callable by the Company at any time that is one month prior to the maturity date at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.35% plus, in each case, accrued and unpaid interest.

[9] Instrument was called by the Company on July 15, 2015 at a redemption price of 103.938% of the principal amount, together with accrued and unpaid interest at the redemption date.

[10] Instrument is callable by the Company at any time at the greater of 100% of the principal amount or the sum of the present values of the remaining scheduled payments of principal and interest discounted at the U.S. Treasury rate plus 0.25% plus, in each case, accrued and unpaid interest.