Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015		Dec. 31, 2014		Dec. 24, 2013	Nov. 13, 2013	Jun. 18, 2013	May. 12, 2010	Sep. 15, 2008
Debt Instrument [Line Items]
Net debt carrying amount		$ 7,989.6		$ 8,138.5
Current portion of long-term debt		2,099.2		2,405.7
Long-term debt, excluding current maturities		5,890.4		5,732.8
Other
Debt Instrument [Line Items]
Current portion of long-term debt		4.5
Term Loan | 2014 Term Loan
Debt Instrument [Line Items]
Net debt carrying amount		800.0		800.0
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Net debt carrying amount		160.0		0.0
Convertible Debt | Cash Convertible Notes
Debt Instrument [Line Items]
Stated percentage rate										3.75%
Current portion of long-term debt	[1]	2,097.3		2,405.6
Senior Notes | 2016 Senior Notes (1.800% coupon)
Debt Instrument [Line Items]
Stated percentage rate	[2]							1.80%
Net debt carrying amount	[2]	$ 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]
Stated percentage rate	[3]						1.35%
Net debt carrying amount	[3]	$ 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]
Stated percentage rate	[4]							2.60%
Net debt carrying amount	[4]	$ 649.2		649.0
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]
Stated percentage rate	[2]						2.55%
Net debt carrying amount	[2]	$ 499.1		499.0
Equivalent percentage of redeemed amount		100.00%
Debt instrument, basis spread on variable rate		0.20%
Senior Notes | 2020 Senior Notes (7.875% coupon)
Debt Instrument [Line Items]
Stated percentage rate	[5]								7.875%
Net debt carrying amount		$ 1,009.7	[5]	1,010.5	[6]
Debt instrument, redemption price, percentage		103.938%
Senior Notes | 2023 Senior Notes (3.125% coupon)
Debt Instrument [Line Items]
Stated percentage rate	[2]					3.125%
Net debt carrying amount	[2]	$ 774.5		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]
Stated percentage rate	[6]						4.20%
Net debt carrying amount	[6]	$ 498.3		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]
Stated percentage rate	[6]						5.40%
Net debt carrying amount	[6]	$ 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] As of June 30, 2015 and December 31, 2014, the cash convertible notes were classified as current portion of long-term debt on the Condensed Consolidated Balance Sheets.

[2] 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.

[3] 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.

[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 0.30% plus, in each case, accrued and unpaid interest.

[5] 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.

[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 0.25% plus, in each case, accrued and unpaid interest.