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Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) channel	Sep. 30, 2017 USD ($)	Oct. 31, 2018 USD ($)	Jul. 11, 2018	Dec. 31, 2017 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Number of products sales channels \| channel				2
Ownership percentage	50.00%			50.00%
Net investment	$ 18.7			$ 18.7				$ 21.5
Revenue Recognition [Abstract]
Allowance for doubtful accounts included in accounts receivable, net	31.9			31.9				24.7
Tax benefit recognized					$ 9.3
Revenues	729.5	$ 711.5		2,026.8	$ 2,069.2
Mattress Firm
Revenue Recognition [Abstract]
Restructuring charges			$ 25.9
Tax benefit recognized			9.3
Revenues			9.3
Mattress Firm \| Cost of Sales
Revenue Recognition [Abstract]
Restructuring charges			11.5
Write-off of inventory			5.4
Warranty costs			6.1
Mattress Firm \| Customer Termination Charges, Net
Revenue Recognition [Abstract]
Restructuring charges			14.4
Write off of incentives and marketing assets, employee-related costs, and professional fees			22.8
Accelerated amortization			$ 0.9
Accrued expenses and other current liabilities
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accrued sales returns	23.4			23.4				19.6
Warranty Term [Abstract]
Accrued warranty expense	15.1			15.1				16.7
Other noncurrent liabilities
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accrued sales returns	12.4			12.4				10.4
Warranty Term [Abstract]
Accrued warranty expense	$ 21.6			$ 21.6				$ 20.0
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
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Equity method investment, ownership percentage				45.00%
Equity method investment, remaining ownership percentage							55.00%
Subsequent Event \| Cross Currency Interest Rate Contract
Revenue Recognition [Abstract]
Notional amount						$ 50.0
Fixed interest rate						2.0575%
2026 Senior Notes \| Subsequent Event
Revenue Recognition [Abstract]
Fixed interest rate						5.50%