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Acquisitions and Divestitures - (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Feb. 05, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
retailLocation
distributionCenter
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Business Acquisition [Line Items]        
Net sales     $ 1,604.7 $ 1,189.4
Net income     (33.1) 76.3
Operating income (loss)     13.2 131.5
Mattress Firm        
Business Acquisition [Line Items]        
Net sales     593.7 0.0
Net income     0.8  
Forecast        
Business Acquisition [Line Items]        
Number of retail locations | retailLocation   73    
Specialty retail locations | retailLocation   103    
Number of distribution centers | distributionCenter   7    
Delayed Draw Term Loan | 2023 Credit Agreement | Line of Credit        
Business Acquisition [Line Items]        
Proceeds from lines of credit $ 625.0      
Revolving Credit Facility | Line of Credit        
Business Acquisition [Line Items]        
Proceeds from sale of real estate held-for-investment, escrow 1,592.0      
Revolving Credit Facility | 2023 Credit Agreement | Line of Credit        
Business Acquisition [Line Items]        
Proceeds from lines of credit 679.5      
Mattress Firm        
Business Acquisition [Line Items]        
Net consideration transferred 5,151.7      
Cash acquired in excess of payments to acquire business 300.0      
Cash $ 3,102.0      
Shares issued in acquisition (in shares) | shares 34.2      
Closing share price (in dollars per share) | $ / shares $ 65.65      
Business combination, acquisition related costs     50.2 14.8
Net sales     $ 267.1 $ 735.8