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Summary of Significant Accounting Policies - Inventory, warranty and other (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Inventory [Abstract]
Finished goods	$ 129.4		$ 130.1
Work-in-process	11.5		10.7
Raw materials and supplies	51.3		56.0
Total	192.2		196.8
Write-off of inventory	5.4
Revenue Recognition [Abstract]
Allowance for doubtful accounts included in accounts receivable, net	21.3		$ 22.1
Accelerated amortization	0.9	$ 2.0
Tax benefit recognized	9.3
Payments received	722.1	$ 721.0
Foreign Exchange Forward
Revenue Recognition [Abstract]
Notional amount	12.8
Gain on derivative	$ 0.1
North America \| Pillows
Warranty Term [Abstract]
Warranty term (in years)	3 years
Non-prorated \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	5 years
Prorated \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	10 years
Minimum \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	10 years
Minimum \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	5 years
Minimum \| Non-prorated \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	10 years
Maximum \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	25 years
Maximum \| International \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	15 years
Maximum \| Non-prorated \| North America \| Mattresses
Warranty Term [Abstract]
Warranty term (in years)	15 years
Sales Returns
Sales returns [Roll Forward]
Beginning balance	$ 30.3
Amounts accrued	34.3
Returns charged to accrual	(34.9)
Ending balance	29.7
Warranty Reserves
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	29.9
Amounts accrued	14.8
Warranties charged to accrual	(7.5)
Ending balance	37.2
Accounts Payable and Accrued Liabilities
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	14.3
Ending balance	16.3
Other Noncurrent Liabilities
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	15.6
Ending balance	20.9
Mattress Firm
Movement in Standard Product Warranty Accrual [Roll Forward]
Ending balance	6.1
Revenue Recognition [Abstract]
Restructuring charges	25.9
Tax benefit recognized	9.3
Payments received	9.3
Mattress Firm \| Cost of Sales
Inventory [Abstract]
Write-off of inventory	5.4
Revenue Recognition [Abstract]
Restructuring charges	11.5
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