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Segments - Products and Services (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenue from External Customer [Line Items]
Net sales									$ 4,067.7	$ 4,070.4	$ 4,000.3
Product And Services, Excluding Financial Services
Revenue from External Customer [Line Items]
Net sales	$ 955.2	$ 901.8	$ 951.3	$ 921.7	$ 952.5	$ 898.1	$ 954.6	$ 935.5	3,730.0	3,740.7	3,686.9
Product And Services, Excluding Financial Services | Tools
Revenue from External Customer [Line Items]
Net sales									2,017.5	2,021.2	1,946.7
Product And Services, Excluding Financial Services | Diagnostics, information and management systems
Revenue from External Customer [Line Items]
Net sales									827.5	797.9	800.4
Product And Services, Excluding Financial Services | Equipment
Revenue from External Customer [Line Items]
Net sales									885.0	921.6	939.8
Financial Services
Revenue from External Customer [Line Items]
Net sales									$ 337.7	$ 329.7	$ 313.4

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