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Acquisitions and Divestitures - iMS Price Purchase Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Apr. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 766.3 $ 732.3   $ 723.0
Innovative Mattress Solutions, LLC (IMS)        
Business Acquisition [Line Items]        
Working capital (accounts receivable and inventory, net of accounts payable and accrued liabilities)     $ (1.4)  
Property and equipment     5.0  
Goodwill     2.4  
Other intangible assets     2.1  
Operating lease right-of-use assets     28.5  
Long-term operating lease liabilities     (28.5)  
Purchase price, net of cash acquired     $ 8.1