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Acquisitions - Schedule of Business Acquisitions by Acquisition, Fair Value of Consideration Transferred (Details) - USD ($) $ in Millions | Jul. 19, 2021 | Aug. 28, 2021 | May 29, 2021
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Business Acquisition [Line Items] |  |  |
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares) |  | 75,784,091 | 59,029,165
Shares of Knoll common stock issued and outstanding at July 19, 2021 (in shares) |  | 75,784,091 | 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 |  |

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