Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $)	2 Months Ended	3 Months Ended		9 Months Ended													3 Months Ended		9 Months Ended				9 Months Ended	1 Months Ended			2 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2012	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Mar. 31, 2012 Notes payable due 2012 Fixed-to-Floating Interest Rate Swaps Terminated	Jan. 31, 2012 Notes payable due 2012 Fixed-to-Floating Interest Rate Swaps Terminated	Aug. 31, 2012 Notes payable due 2013	Aug. 31, 2012 Notes payable due 2014	Sep. 29, 2012 Notes payable due 2016 Fixed-to-Floating Interest Rate Swaps Terminated	Jan. 31, 2012 Notes payable due 2016 Fixed-to-Floating Interest Rate Swaps Terminated	Sep. 29, 2012 Notes payable due 2021 Fixed to Floating Interest Rate Swap	Jan. 31, 2012 Notes payable due 2021 Fixed to Floating Interest Rate Swap	Dec. 31, 2011 Notes payable due 2021 Fixed to Floating Interest Rate Swap	Sep. 29, 2012 Notes payable due 2028 Fixed to Floating Interest Rate Swap	Jan. 31, 2012 Notes payable due 2028 Fixed to Floating Interest Rate Swap	Sep. 29, 2012 Subordinated debentures 2052	Jul. 25, 2012 Subordinated debentures 2052	Sep. 29, 2012 Convertible notes payable due in 2012 decimal	Sep. 29, 2012 Convertible notes payable due in 2012	Dec. 31, 2011 Convertible notes payable due in 2012	Aug. 31, 2012 Notes 8 Point 95 Percent Due 2014	Sep. 29, 2012 BondHedge [Member]	Jul. 31, 2012 Old Credit Facility [Member]	Jul. 31, 2012 New Credit Facility [Member]	Jul. 30, 2012 New Credit Facility [Member]	Aug. 31, 2012 Purchase accounting FV adjustments [Member]	Aug. 31, 2012 Gain (Loss) on Derivatives [Member]	Sep. 29, 2012 Number of stock warrants	Oct. 01, 2011 Number of stock warrants	Sep. 29, 2012 Number of stock warrants	Oct. 01, 2011 Number of stock warrants
Debt Instrument [Line Items]
Debt instrument, face amount		$ 320,000,000		$ 320,000,000			$ 200,000,000	$ 250,000,000	$ 300,000,000		$ 300,000,000	$ 400,000,000	$ 200,000,000	$ 200,000,000		$ 150,000,000						$ 350,000,000
Unamortized gain on terminated swap		19,400,000		19,400,000		400,000				11,600,000		400,000			4,800,000
Long-term debt fair value adjustment										17,000,000					17,000,000
Stock Issued During Period, Shares, Conversion of Convertible Securities				640,018																			640,772
Conversion rate of convertible notes based on common shares																			1,000	15.6666
Conversion price of convertible note (in dollars per share)																			$ 63.83	$ 63.83
Common Stock Price Per Share				$ 73.24
Aggregate effect of financial instruments on common shares				754
Antidilutive securities excluded from the computation of EPS																													3,704,000	4,939,000	4,445,000	4,939,000
Junior Subordinated Notes																		750,000,000
Stated interest rate								6.15%	4.75%									5.75%	3.50%	3.50%	3.50%	8.95%
Proceeds from long-term debt		729,400,000	900,000	729,400,000	21,400,000												729,400,000
Payments of debt issuance costs																	20,600,000
Threshold percentage of principal plus accrued interest for redemption																		100.00%
Payments of Debt Extinguishment Costs	91,000,000	91,000,000	0	91,000,000	0
Gains (Losses) on Extinguishment of Debt	(45,500,000)	(45,500,000)	0	(45,500,000)	0																						(35,000,000)	(11,000,000)
Commercial paper borrowings outstanding		1,308,400,000		1,308,400,000
Commercial paper borrowings capacity		2,000,000,000		2,000,000,000
Extinguishment of debt																								750,000,000
Line of Credit Facility, Number of Days Available																								364 days
Line of Credit Facility, Maximum Borrowing Capacity																										1,000,000,000
Line of Credit Facility, Term Out Provision Period																									1 year
Foreign currency sublimit																										$ 400,000,000