Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Apr. 02, 2011
Debt instrument
Total debt	$ 2,382,002,000	$ 2,325,715,000
Less current debt	(69,144,000)	(56,695,000)
Total long term debt	2,312,858,000	2,269,020,000
2011 Credit Agreement
Debt agreements
Revolving credit facility, maximum borrowing capacity			2,725,000,000
2011 term loan A
Debt instrument
Total debt	894,837,000	894,837,000
Weighted average stated interest rate (as a percent)	3.48%
Debt agreements
Principal amount of credit agreement			950,000,000
Debt instrument, description of variable rate basis	LIBOR or CDOR
2011 term loan A | Minimum
Debt agreements
Basis spread on variable rate (as a percent)	2.25%
2011 term loan A | Maximum
Debt agreements
Basis spread on variable rate (as a percent)	3.00%
2011 term loan B
Debt instrument
Total debt	1,333,163,000	1,333,163,000
Weighted average stated interest rate (as a percent)	4.00%
Debt agreements
Principal amount of credit agreement			1,400,000,000
Debt instrument, description of variable rate basis	LIBOR or CDOR
2011 term loan B | Minimum
Debt agreements
Rate of LIBOR floor (as a percent)	1.00%
Basis spread on variable rate (as a percent)	2.75%
2011 term loan B | Maximum
Debt agreements
Basis spread on variable rate (as a percent)	3.00%
Revolving Credit Facility
Debt instrument
Total debt	75,138,000	10,000,000
Weighted average stated interest rate (as a percent)	4.01%
Debt agreements
Revolving credit facility, maximum borrowing capacity			375,000,000
Debt instrument, description of variable rate basis	LIBOR or CDOR
Commitment fee on the unused portion (as a percent)	0.50%
Outstanding standby letters of credit	71,800,000
Availability for future borrowings under the Revolver	228,100,000
Revolving Credit Facility | Minimum
Debt agreements
Basis spread on variable rate (as a percent)	2.25%
Revolving Credit Facility | Maximum
Debt agreements
Basis spread on variable rate (as a percent)	3.00%
Other
Debt instrument
Total debt	$ 78,864,000	$ 87,715,000