CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net sales	$ 2,122.6	$ 1,300.0	$ 5,608.1	$ 3,723.0
Cost of sales	1,169.8	748.5	3,247.6	2,179.6
Gross profit	952.8	551.5	2,360.5	1,543.4
Selling and marketing expenses	480.8	233.6	1,303.9	699.9
General, administrative and other expenses	160.4	118.6	545.8	347.4
Loss on disposal of business	0.0	0.0	13.9	0.0
Equity income in earnings of unconsolidated affiliates	(3.1)	(2.5)	(10.9)	(10.5)
Operating income	314.7	201.8	507.8	506.6
Other expense, net:
Interest expense, net	69.9	30.8	203.7	98.5
Other expense (income), net	10.9	0.4	16.8	(0.5)
Total other expense, net	80.8	31.2	220.5	98.0
Income before income taxes	233.9	170.6	287.3	408.6
Income tax provision	(56.2)	(40.8)	(42.9)	(95.5)
Net income before non-controlling interest	177.7	129.8	244.4	313.1
Less: Net income (loss) attributable to non-controlling interest	0.3	(0.2)	1.1	0.7
Net income attributable to Somnigroup International Inc.	$ 177.4	$ 130.0	$ 243.3	$ 312.4
Earnings per common share:
Basic (in dollars per share)	$ 0.85	$ 0.75	$ 1.19	$ 1.80
Diluted (in dollars per share)	$ 0.83	$ 0.73	$ 1.17	$ 1.75
Weighted average common shares outstanding:
Basic (in shares)	209.9	173.7	204.7	173.6
Diluted (in shares)	212.5	178.2	207.9	178.1