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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net income attributable to Somnigroup International Inc.	$ 99.0	$ 106.1	$ 65.9	$ 182.4
Denominator:
Denominator for basic earnings per common share-weighted average shares (in shares)	209.2	173.7	202.1	173.6
Effect of dilutive securities (in shares)	3.2	4.3	3.6	4.4
Denominator for diluted earnings per common share-adjusted weighted average shares (in shares)	212.4	178.0	205.7	178.0
Basic earnings per common share (in dollars per share)	$ 0.47	$ 0.61	$ 0.33	$ 1.05
Diluted earnings per common share (in dollars per share)	$ 0.47	$ 0.60	$ 0.32	$ 1.02

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