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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net income attributable to Somnigroup International Inc.	$ 177.4	$ 130.0	$ 243.3	$ 312.4
Denominator:
Denominator for basic earnings per common share-weighted average shares (in shares)	209.9	173.7	204.7	173.6
Effect of dilutive securities (in shares)	2.6	4.5	3.2	4.5
Denominator for diluted earnings per common share-adjusted weighted average shares (in shares)	212.5	178.2	207.9	178.1
Basic earnings per common share (in dollars per share)	$ 0.85	$ 0.75	$ 1.19	$ 1.80
Diluted earnings per common share (in dollars per share)	$ 0.83	$ 0.73	$ 1.17	$ 1.75
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares)	1.2		0.4

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