Acquisitions and Divestitures - Price Purchase Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2019	Apr. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 732.3		$ 723.0	$ 732.7
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, plant 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)
Net purchase price		$ 8.1