Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Details) $ in Millions	9 Months Ended
	Sep. 27, 2025 USD ($)
Goodwill [Roll Forward]
Beginning balances	$ 1,056.8
Currency translation	49.0
Ending balances	1,105.8
Commercial & Industrial Group
Goodwill [Roll Forward]
Beginning balances	315.6
Currency translation	31.7
Ending balances	347.3
Snap-on Tools Group
Goodwill [Roll Forward]
Beginning balances	12.4
Currency translation	0.0
Ending balances	12.4
Repair Systems & Information Group
Goodwill [Roll Forward]
Beginning balances	728.8
Currency translation	17.3
Ending balances	$ 746.1