Fair Value Measurements, Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015		Sep. 27, 2014	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Costs associated with entering into interest rate swap arrangements included in ineffective portion of loss recognized			$ 7.5
Cash Flow Hedge Arrangements
Notional Amount Of Derivatives	$ 6,870.0		6,870.0			$ 3,740.0
Change in fair value of cash flow hedges, net of tax	(28.7)	$ 0.0	(5.7)		$ 0.0
Net Investment Hedge
Gain (Loss) in Currency Translation Adjustment on Net Investment Hedge			$ 43.3
Derivatives Designated as Cash Flow Hedges [Member]
Cash Flow Hedge Arrangements
Debt Instrument, Term			10 years
Notional Amount Of Derivatives	1,000.0		$ 1,000.0
Change in fair value of cash flow hedges, net of tax			(5.7)
Interest Rate Swaps [Member] | Other Expense [Member] | Derivatives Designated as Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	9.5	1.1	25.7		3.2
Ineffective Portion of Gain (Loss) Recognized	(0.2)	(2.3)	(7.4)	[1]	(0.5)
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments | Other Assets [Member]
Fair Value - Assets
Derivative Asset, Fair Value	18.9		18.9
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments | Accrued Expense [Member]
Fair Value - Liabilities
Derivative Liability, Fair Value	9.3		9.3
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments | Other Long-term Liabilities [Member]
Fair Value - Liabilities
Derivative Liability, Fair Value						3.7
Foreign Currency Exchange Contracts [Member] | Cost of Revenues [Member] | Derivatives Not Designated as Fair Value Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(6.0)	7.0	11.5		11.2
Foreign Currency Exchange Contracts [Member] | Other Expense [Member] | Derivatives Not Designated as Fair Value Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized	(6.4)	$ 75.9	130.6		$ 76.1
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Fair Value Hedges | Other Current Assets [Member]
Fair Value - Assets
Derivative Asset, Fair Value	6.3		6.3			20.2
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Fair Value Hedges | Accrued Expense [Member]
Fair Value - Liabilities
Derivative Liability, Fair Value	$ 18.1		$ 18.1			$ 6.7

[1] The ineffective portion of the loss recognized on interest rate swaps during the nine months ended September 26, 2015 includes $7.5 million of costs associated with entering into the swap arrangements.