Acquisitions and Divestitures - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions			3 Months Ended		6 Months Ended
	May 01, 2025 retailLocation distributionCenter	Feb. 05, 2025 USD ($) retailLocation $ / shares shares	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Business Combination [Line Items]
Number of retail locations | retailLocation	73
Specialty retail locations | retailLocation	103
Number of distribution centers | distributionCenter	7
Goodwill			$ 4,584.5		$ 4,584.5		$ 4,595.9
Net sales			1,823.5	$ 1,880.8	3,625.0	$ 3,485.5
Net income			110.9	99.0	215.1	65.9
Mattress Firm
Business Combination [Line Items]
Goodwill			3,493.9		3,493.9		$ 3,493.9
Net sales			922.2	948.8	$ 1,808.1	1,542.5
Net income			$ 52.7	52.3
Mattress Firm
Business Combination [Line Items]
Net consideration transferred		$ 5,141.4
Cash acquired in excess of payments to acquire business		300.0
Cash		$ 3,091.5
Shares issued in acquisition (in shares) | shares		34.2
Closing share price (in dollars per share) | $ / shares		$ 65.65
Number of retail locations | retailLocation		2,100
Goodwill, deductible for income tax		$ 164.6
Goodwill, non-deductible for income tax		3,329.3
Goodwill		$ 3,493.9
Business combination, acquisition related costs				$ 50.2		50.2
Net sales						$ 262.1