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Acquisitions (Narrative) (Details) - USD ($) $ in Millions		6 Months Ended
	Apr. 01, 2019	Jun. 30, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Goodwill, acquired during period		$ 7.5
International
Business Acquisition [Line Items]
Transaction value	$ 7.1
Goodwill, acquired during period	2.9	$ 5.4
Other intangible assets	2.9
Innovative Mattress Solutions, LLC (IMS)
Business Acquisition [Line Items]
Transaction value	24.0
Liabilities			$ 11.0
Consideration transferred	13.2
Cash and equivalents	5.1
Payments to acquire businesses	8.1
Other intangible assets	3.3
Innovative Mattress Solutions, LLC (IMS) | Trade Name and Customer Database
Business Acquisition [Line Items]
Intangible assets acquired	$ 3.3

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