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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net (loss) income attributable to Somnigroup International Inc.	$ (33.1)	$ 76.3
Denominator:
Denominator for basic earnings per common share-weighted average shares (in shares)	194.9	173.6
Effect of dilutive securities (in shares)	4.0	4.4
Denominator for diluted earnings per common share-adjusted weighted average shares (in shares)	198.9	178.0
Basic earnings per common share (in dollars per share)	$ (0.17)	$ 0.44
Diluted earnings per common share (in dollars per share)	$ (0.17)	$ 0.43

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