Summary of Option Activity (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012	Jul. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2011, Options			8.3
Granted, Options	1.5	1.1	1.5	1.1
Exercised, Options			(1.0)
Cancelled, Options			(0.1)
Outstanding at June 30, 2012, Options	8.7		8.7
Exercisable at June 30, 2012, Options	4.8		4.8
Outstanding at December 31, 2011, Weighted-Average Exercise Price			$ 26.39
Granted, Weighted-Average Exercise Price			$ 53.79
Exercised, Weighted-Average Exercise Price			$ 17.56
Cancelled, Weighted-Average Exercise Price			$ 32.54
Outstanding at June 30, 2012, Weighted-Average Exercise Price	$ 32.16		$ 32.16
Exercisable at June 30, 2012, Weighted-Average Exercise Price	$ 23.02		$ 23.02
Outstanding at June 30, 2012, Weighted-Average Remaining Contractual Term, years			6 years 7 months 6 days
Exercisable at June 30, 2012, Weighted-Average Remaining Contractual Term, years			4 years 9 months 18 days
Outstanding at June 30, 2012, Aggregate Intrinsic Value	$ 202.8		$ 202.8
Exercisable at June 30, 2012, Aggregate Intrinsic Value	$ 157.3		$ 157.3