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Summary of Significant Accounting Policies (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) channel	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Valuation and Qualifying Accounts Disclosure [Line Items]
Number of products sales channels | channel				2
Ownership percentage	50.00%			50.00%
Net investment	$ 18,800,000			$ 18,800,000		$ 15,500,000
Revenue Recognition [Abstract]
Allowance for doubtful accounts included in accounts receivable, net	26,700,000			26,700,000		22,100,000
Accelerated amortization	0		$ 0	900,000	$ 2,000,000
Tax benefit recognized				9,300,000
Revenues	724,800,000		$ 832,400,000	2,106,200,000	$ 2,357,800,000
Mattress Firm
Revenue Recognition [Abstract]
Restructuring charges		$ 25,900,000
Tax benefit recognized		9,300,000
Revenues		9,300,000
Mattress Firm | Cost of Sales
Revenue Recognition [Abstract]
Restructuring charges		11,500,000
Write-off of inventory		5,400,000
Warranty costs		6,100,000
Mattress Firm | Customer Termination Charges, Net
Revenue Recognition [Abstract]
Restructuring charges		14,400,000
Write off of incentives and marketing assets, employee-related costs, and professional fees		22,800,000
Accelerated amortization		$ 900,000
Foreign Exchange Forward
Revenue Recognition [Abstract]
Notional amount
Gain (loss) on derivative expected to be reclassified
Accounts Payable and Accrued Liabilities
Warranty Term [Abstract]
Accrued warranty expense	19,900,000			19,900,000		14,300,000
Other Noncurrent Liabilities
Warranty Term [Abstract]
Accrued warranty expense	$ 19,000,000			$ 19,000,000		$ 15,600,000
Mattresses | Non-prorated | International
Warranty Term [Abstract]
Warranty term (in years)				5 years
Mattresses | Prorated | International
Warranty Term [Abstract]
Warranty term (in years)				10 years
Mattresses | Minimum | North America
Warranty Term [Abstract]
Warranty term (in years)				10 years
Mattresses | Minimum | International
Warranty Term [Abstract]
Warranty term (in years)				5 years
Mattresses | Minimum | Non-prorated | North America
Warranty Term [Abstract]
Warranty term (in years)				10 years
Mattresses | Maximum | North America
Warranty Term [Abstract]
Warranty term (in years)				25 years
Mattresses | Maximum | International
Warranty Term [Abstract]
Warranty term (in years)				15 years
Mattresses | Maximum | Non-prorated | North America
Warranty Term [Abstract]
Warranty term (in years)				15 years
Pillows | North America
Warranty Term [Abstract]
Warranty term (in years)				3 years
Comfort Revolution
Valuation and Qualifying Accounts Disclosure [Line Items]
Equity method investment, ownership percentage				45.00%

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