Segment Information Sales by Major Product Group (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Sales	$ 1,806.7	$ 1,685.3	$ 1,628.8	$ 1,535.2	$ 1,627.1	$ 1,567.4	$ 1,555.1	$ 1,474.7	$ 6,656.0	$ 6,224.3	$ 6,178.8
Professional Tools and Equipment [Member]
Revenue from External Customer [Line Items]
Sales									4,352.5	4,005.9	3,959.7
Industrial Automation, Controls and Sensors [Member]
Revenue from External Customer [Line Items]
Sales									1,207.7	1,138.2	1,170.5
Franchise Distribution [Member]
Revenue from External Customer [Line Items]
Sales									626.2	618.1	590.4
All Other Products and Services [Member]
Revenue from External Customer [Line Items]
Sales									$ 469.6	$ 462.1	$ 458.2