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Segments - Products and Services (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Total revenues									$ 4,070.4	$ 4,000.3	$ 3,711.8
Product And Services, Excluding Financial Services
Revenue from External Customer [Line Items]
Total revenues	$ 952.5	$ 898.1	$ 954.6	$ 935.5	$ 974.6	$ 903.8	$ 921.4	$ 887.1	3,740.7	3,686.9	3,430.4
Product And Services, Excluding Financial Services | Tools
Revenue from External Customer [Line Items]
Total revenues									2,021.2	1,946.7	1,899.2
Product And Services, Excluding Financial Services | Diagnostics, information and management systems
Revenue from External Customer [Line Items]
Total revenues									797.9	800.4	748.2
Product And Services, Excluding Financial Services | Equipment
Revenue from External Customer [Line Items]
Total revenues									921.6	939.8	783.0
Financial Services
Revenue from External Customer [Line Items]
Total revenues									$ 329.7	$ 313.4	$ 281.4

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