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Acquisitions - Schedule of Business Acquisitions by Acquisition, Fair Value of Consideration Transferred (Details) - USD ($)
$ in Millions
Jul. 19, 2021
Nov. 27, 2021
May 29, 2021
Business Acquisition [Line Items]      
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares)   75,740,388 59,029,165
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares)   75,740,388 59,029,165
Preferred stock, shares issued (in shares)   0 0
Knoll      
Business Acquisition [Line Items]      
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares) 49,444,825    
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares) 49,444,825    
Shares of Knoll Common Stock issued and outstanding at July 19, 2021 $ 543.9    
Knoll equivalent shares for outstanding option awards, outstanding awards of restricted common stock held by non-employee directors and outstanding awards of performance units held by individuals who are former employees of Knoll and remain eligible to vest at July 19, 2021 (in shares) 184,857    
Knoll equivalent shares for outstanding option awards, outstanding awards of restricted common stock held by non-employee directors and outstanding awards of performance units held by individuals who are former employees of Knoll and remain eligible to vest at July 19, 2021 $ 1.4    
Total number of Knoll shares for cash consideration (in shares) 49,629,682    
Preferred stock, shares issued (in shares) 169,165    
Preferred Stock, Shares Outstanding 169,165    
Shares of Knoll Preferred Stock issued and outstanding at July 19, 2021 $ 254.4    
Total number of Knoll shares for share consideration (in shares) 49,519,682    
Knoll | Restricted stock      
Business Acquisition [Line Items]      
Knoll equivalent shares for outstanding awards of restricted common stock held by non-employee directors and outstanding awards of performance units held by individuals who are former employees of Knoll and remain eligible to vest at July 19, 2021 (in shares) 74,857    
Knoll      
Business Acquisition [Line Items]      
Consideration for payment to settle Knoll's outstanding debt $ 376.9    
Total number of Knoll shares for share consideration (in shares) 15,843,921    
Total number of Knoll shares for share consideration $ 688.3    
Outstanding awards of Knoll Restricted Stock and Performance units relating to Knoll Common Stock at July 19, 2021 22.4    
Total preliminary acquisition date fair value of consideration transferred $ 1,887.3