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Acquisitions (Price Purchase Allocation) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Apr. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 730.4   $ 723.0
Innovative Mattress Solutions, LLC (IMS)      
Business Acquisition [Line Items]      
Working capital (accounts receivable and inventory, net of accounts payable and accrued liabilities)   $ (2.3)  
Property and equipment   5.0  
Goodwill   3.3  
Other intangible assets   2.1  
Operating lease right-of-use assets   28.5  
Long-term operating lease liabilities   (28.5)  
Net purchase price   $ 8.1