v3.26.1

Acquisitions and Divestitures - Schedule of Business Acquisition, Pro Forma Information, Nonrecurring Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Business Combination [Line Items]
Net sales	$ 1,801.5	$ 1,604.7
Total adjustments to net loss	103.9	(32.8)
Mattress Firm
Business Combination [Line Items]
Net sales	267.1
Total adjustments to net loss	(208.0)
Business combination, initial accounting incomplete, adjustment to stock compensation expense	340.5
Business combination, acquisition related costs	$ 50.2	$ 50.2
Income tax (provision) percentage of proforma adjustment	25.00%
Mattress Firm \| Mattress Firm pre-acquisition net revenue
Business Combination [Line Items]
Net sales	$ 345.1
Mattress Firm \| Elimination of intercompany sales to Mattress Firm
Business Combination [Line Items]
Net sales	(78.0)
Mattress Firm \| Mattress Firm pre-acquisition (loss) earnings
Business Combination [Line Items]
Total adjustments to net loss	(318.3)
Mattress Firm \| Transaction Costs
Business Combination [Line Items]
Total adjustments to net loss	50.2
Mattress Firm \| Intercompany Profit Elimination
Business Combination [Line Items]
Total adjustments to net loss	62.0
Mattress Firm \| Purchase Price Allocation Adjustments
Business Combination [Line Items]
Total adjustments to net loss	16.7
Mattress Firm \| Interest expense adjustments
Business Combination [Line Items]
Total adjustments to net loss	(2.4)
Mattress Firm \| Tax effect of Pro Forma Adjustments
Business Combination [Line Items]
Total adjustments to net loss	$ (16.2)

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pre-Acquisition (Loss) Earnings

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SOMNIGROUP INTERNATIONAL INC. 10-Q