CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interest	$ 177.7	$ 129.8	$ 244.4	$ 313.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(13.9)	37.0	84.6	14.0
Net change in pension benefits, net of tax	0.0	0.0	0.6	(0.3)
Other comprehensive (loss) income, net of tax	(13.9)	37.0	85.2	13.7
Comprehensive income	163.8	166.8	329.6	326.8
Less: Comprehensive income (loss) attributable to non-controlling interest	0.3	(0.2)	1.1	0.7
Comprehensive income attributable to Somnigroup International Inc.	$ 163.5	$ 167.0	$ 328.5	$ 326.1