Exit and Disposal Activities - Recorded Costs Associated with Exit and Disposal Activities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	$ 1.4	$ 1.8	$ 3.4	$ 4.7
Commercial & Industrial Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.2	0	2.3
Snap-on Tools Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.2	0	0.3
Repair Systems & Information Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	1.4	1.4	3.4	2.0
Financial Services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0	0	0.1
Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	1.2	0.8	3.2	3.1
Cost of Goods Sold [Member] | Commercial & Industrial Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.1	0	2.2
Cost of Goods Sold [Member] | Snap-on Tools Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.1	0	0.1
Cost of Goods Sold [Member] | Repair Systems & Information Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	1.2	0.6	3.2	0.8
Operating Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0.2	1.0	0.2	1.5
Operating Expenses [Member] | Commercial & Industrial Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.1	0	0.1
Operating Expenses [Member] | Snap-on Tools Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0.1	0	0.2
Operating Expenses [Member] | Repair Systems & Information Group [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0.2	0.8	0.2	1.2
Operating Expenses [Member] | Financial Services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	$ 0	$ 0	$ 0	$ 0.1