Basic and Diluted Loss Per Common Share - Schedule of Calculation of Basic Loss Per Common Share to Diluted Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (64.0)	$ (39.7)
Net loss attributable to non-controlling interests and redeemable non-controlling interests	3.4	5.1
Net loss attributable to INNOVATE Corp.	(60.6)	(34.6)
Less: Preferred stock dividends	3.4	1.2
Net loss attributable to common stockholders and participating preferred stockholders, basic	(64.0)	(35.8)
Net loss attributable to common stockholders and participating preferred stockholders, diluted	$ (64.0)	$ (35.8)
Weighted-average common shares outstanding
Weighted-average common shares/ Series C shares outstanding (in shares)	13,217,593	10,696,274
Series C Preferred stock (in shares)	0	947,307
Total (in shares)	13,217,593	11,643,581
Percentage of loss allocated to:
Common stock (as percent)	100.00%	91.90%
Series C Preferred stock (as percent)	0.00%	8.10%
Numerator for loss per share:
Net loss attributable to common stockholders, basic	$ (64.0)	$ (32.9)
Net loss attributable to common stockholders, diluted	$ (64.0)	$ (32.9)
Denominator for loss per share:
Weighted-average common shares outstanding - basic (in shares)	13,217,593	10,696,274
Weighted average common shares/ Series C shares outstanding - diluted (in shares)	13,217,593	10,696,274
Loss per share
Loss per common share - basic (in usd per share)	$ (4.84)	$ (3.08)
Loss per common share - diluted (in usd per share)	$ (4.84)	$ (3.08)
Series C Preferred Stock
Weighted-average common shares outstanding
Weighted-average common shares/ Series C shares outstanding (in shares)	0	947,307
Numerator for loss per share:
Net loss attributable to common stockholders, basic	$ 0.0	$ (2.9)
Net loss attributable to common stockholders, diluted	$ 0.0	$ (2.9)
Denominator for loss per share:
Weighted-average common shares outstanding - basic (in shares)	0	947,307
Weighted average common shares/ Series C shares outstanding - diluted (in shares)	0	947,307
Loss per share
Loss per common share - basic (in usd per share)	$ 0	$ (3.08)
Loss per common share - diluted (in usd per share)	$ 0	$ (3.08)

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477787/942-405-45-2