Basic and Diluted Loss Per Common Share - Schedule of Calculation of Basic Loss Per Common Share to Diluted Loss Per Common Share (Details) $ / shares in Units, $ in Millions			12 Months Ended
		Aug. 08, 2024	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss			$ (39.7)	$ (38.9)
Net loss attributable to non-controlling interest and redeemable non-controlling interest			5.1	3.7
Net loss attributable to INNOVATE Corp.			(34.6)	(35.2)
Less: Preferred dividends			1.2	2.4
Net loss attributable to common stockholders and participating preferred stockholders, basic			(35.8)	(37.6)
Net loss attributable to common stockholders and participating preferred stockholders, diluted			$ (35.8)	$ (37.6)
Loss allocable to common shares:
Weighted-average common shares outstanding (in shares) | shares	[1]		10,696,274	7,814,620
Series C Preferred stock (in shares) | shares			947,307	0
Total (in shares) | shares			11,643,581	7,814,620
Percentage of loss allocated to:
Common stock (as percent)			91.90%	100.00%
Series C Preferred stock (as percent)			8.10%	0.00%
Numerator and denominator for (loss) per share
Net loss attributable to common stock holders, basic			$ (32.9)	$ (37.6)
Net loss attributable to common stock holders, diluted			(32.9)	(37.6)
Net loss attributable to Series C holder, basic			(2.9)	0.0
Net loss attributable to Series C holder, diluted			$ (2.9)	$ 0.0
Weighted average common shares/ Series C shares outstanding - basic (in shares) | shares	[1]		10,696,274	7,814,620
Weighted average common shares/ Series C shares outstanding - diluted (in shares) | shares	[1]		10,696,274	7,814,620
Loss per common share/ series C share - basic (in usd per share) | $ / shares	[1]		$ (3.08)	$ (4.81)
Loss per common share/ series C share - diluted (in usd per share) | $ / shares	[1]		$ (3.08)	$ (4.81)
Reverse stock split, conversion ratio		0.1
Series C Preferred Stock
Loss allocable to common shares:
Weighted-average common shares outstanding (in shares) | shares			947,307	0
Numerator and denominator for (loss) per share
Weighted average common shares/ Series C shares outstanding - basic (in shares) | shares			947,307	0
Weighted average common shares/ Series C shares outstanding - diluted (in shares) | shares			947,307	0
Loss per common share/ series C share - basic (in usd per share) | $ / shares			$ (3.08)	$ 0
Loss per common share/ series C share - diluted (in usd per share) | $ / shares			$ (3.08)	$ 0

[1] Basic and diluted loss per common share and weighted-average common shares outstanding for the year ended December 31, 2023, have been retroactively adjusted to reflect the 1-for-10 reverse stock split effected on August 8, 2024.