Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 29, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,125.8
2025 translation adjustments	1.8
Goodwill, ending balance	$ 1,127.6

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

MasterBrand, Inc. 10-Q