CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Net sales	$ 1,823.5	$ 1,880.8	$ 3,625.0	$ 3,485.5
Cost of sales	1,006.3	1,053.6	2,030.9	2,077.8
Gross profit	817.2	827.2	1,594.1	1,407.7
Selling and marketing expenses	453.5	460.5	882.0	823.1
General, administrative and other expenses	165.1	175.9	332.0	385.4
Equity income in earnings of unconsolidated affiliates	(3.1)	(3.0)	(8.7)	(7.8)
Operating income	201.7	179.9	388.8	193.1
Other expense, net:
Interest expense, net	59.0	72.5	119.0	133.8
Other (income) expense, net	(5.1)	4.7	(15.3)	5.9
Total other expense, net	53.9	77.2	103.7	139.7
Income before income taxes	147.8	102.7	285.1	53.4
Income tax provision (benefit)	(37.2)	(3.2)	(70.6)	13.3
Net income before non-controlling interest	110.6	99.5	214.5	66.7
Less: Net (loss) income attributable to non-controlling interest	(0.3)	0.5	(0.6)	0.8
Net income attributable to Somnigroup International Inc.	$ 110.9	$ 99.0	$ 215.1	$ 65.9
Earnings per common share:
Basic (in dollars per share)	$ 0.53	$ 0.47	$ 1.02	$ 0.33
Diluted (in dollars per share)	$ 0.52	$ 0.47	$ 1.01	$ 0.32
Weighted average common shares outstanding:
Basic (in shares)	210.4	209.2	210.4	202.1
Diluted (in shares)	212.5	212.4	212.6	205.7
Loss on disposal of business	$ 0.0	$ 13.9	$ 0.0	$ 13.9