Derivative Instruments and Hedging Activities Fair Value Balance Sheet (Details) In Millions, unless otherwise specified	Sep. 24, 2011 USD ($)	Dec. 25, 2010 USD ($)	Sep. 24, 2011 Cross currency swaps USD ($)	Dec. 25, 2010 Cross currency swaps USD ($)	Dec. 25, 2010 Cross currency swaps Current derivative liability USD ($)	Dec. 25, 2010 Cross currency swaps Long term derivative liability USD ($)	Sep. 24, 2011 Other current assets Cross currency swaps USD ($)	Dec. 25, 2010 Other current assets Cross currency swaps USD ($)	Sep. 24, 2011 Other assets Cross currency swaps USD ($)	Dec. 25, 2010 Other assets Cross currency swaps USD ($)	Sep. 24, 2011 Current derivative liability Foreign currency forwards USD ($)	Dec. 25, 2010 Current derivative liability Foreign currency forwards USD ($)	Sep. 24, 2011 Long term derivative liability Foreign currency forwards USD ($)	Dec. 25, 2010 Long term derivative liability Foreign currency forwards USD ($)	Sep. 24, 2011 Foreign currency forwards USD ($)	Dec. 25, 2010 Foreign currency forwards USD ($)	Sep. 24, 2011 Foreign currency forwards Other current assets USD ($)	Dec. 25, 2010 Foreign currency forwards Other current assets USD ($)	Sep. 24, 2011 Foreign currency forwards Other assets USD ($)	Dec. 25, 2010 Foreign currency forwards Other assets USD ($)	Sep. 24, 2011 Commodity Contract [Member] gigajoules	Dec. 25, 2010 Commodity Contract [Member] gigajoules	Sep. 24, 2011 Commodity Contract [Member] Current derivative liability USD ($)	Dec. 25, 2010 Commodity Contract [Member] Current derivative liability USD ($)	Sep. 24, 2011 Commodity Contract [Member] Long term derivative liability USD ($)	Dec. 25, 2010 Commodity Contract [Member] Long term derivative liability USD ($)	Sep. 24, 2011 Other current assets Commodity Contract [Member] USD ($)	Dec. 25, 2010 Other current assets Commodity Contract [Member] USD ($)	Sep. 24, 2011 Other assets Commodity Contract [Member] USD ($)	Dec. 25, 2010 Other assets Commodity Contract [Member] USD ($)	Dec. 25, 2010 Current derivative liability Total return swaps USD ($)	Dec. 25, 2010 Total return swaps AUD	Dec. 25, 2010 Total return swaps Other current assets USD ($)	Dec. 25, 2010 Current derivative liability Option contracts USD ($)	Dec. 25, 2010 Option contracts	Dec. 25, 2010 Option contracts Other current assets USD ($)
Derivatives designated as hedging instruments:
Notional Amounts			$ 1,228.6	$ 1,637.1											$ 465.8	$ 426.0
Notional Amount of Derivatives Nonmonetary Designated as Hedging Instrument, Energy																					2,000,000	2,200,000
Derivative asset, fair value, designated as hedging instrument	10.2	0.5					0	0	0	0							2.4	0.3	6.5	0.1							1.1	0.1	0.2	0
Derivative fair value, liability	(198.2)	(404.8)
Derivative Liabilities, Current	104.0	26.4
Derivative fair value, liability	(299.2)	(430.2)			(11.2)	(401.0)					(3.4)	(12.4)	0	(3.4)									(0.3)	(1.8)	0	(0.4)
Derivatives not designated as hedging instruments:
Notional amount of derivative, not designated as hedging instrument																13.9																42.1
Notional amount of derivatives not designated as hedging instrument, in FGL.ASX shares (in shares)																																			7.6
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	4.3																0									0		0				1.2			3.1
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	$ (3.0)	$ (1.0)										$ (0.8)											$ (1.8)		$ (1.2)						$ 0			$ (0.2)