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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	6 Months Ended
	Jul. 03, 2021 USD ($)
Goodwill [Roll Forward]
Balance as of December 28, 2019	$ 982.4
Currency translation	(9.6)
Acquisitions and related adjustments	204.8
Balance as of June 27, 2020	1,177.6
Commercial & Industrial Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	331.2
Currency translation	(6.5)
Acquisitions and related adjustments	9.6
Balance as of June 27, 2020	334.3
Snap-on Tools Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	12.4
Currency translation	0.0
Acquisitions and related adjustments	0.0
Balance as of June 27, 2020	12.4
Repair Systems & Information Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	638.8
Currency translation	(3.1)
Acquisitions and related adjustments	195.2
Balance as of June 27, 2020	$ 830.9

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- Definition

Goodwill acquired and related adjustment.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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