Summary of Significant Accounting Policies - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 facility	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%
Depreciation expense	$ 57.7	$ 59.4	$ 30.9
Product warranty accrual, current	16.1	14.9
Product warranty accrual, noncurrent	15.2	11.2
Allowance for doubtful accounts included in accounts receivable, net	19.5	19.3
Shipping and handling included in net sales	14.7	12.5	4.9
Shipping and handling included in cost of sales	169.2	142.5	99.7
Other income, net of expense	15.6
Advertising costs charged to expense	326.7	274.2	164.5
Advertising costs deferred and included in Prepaid expenses and other current assets	9.7	8.5
Research and development costs charged to expense	21.6	21.0	15.6
Royalty revenue, net of royalty expense	18.1	13.7
Self insurance reserve, excess loss coverage per claim per year	0.4
Self insurance reserve, current	4.8	5.4
Self insurance reserve, noncurrent	$ 10.0	$ 9.5
Number of active plants	4
Number of previously closed US facilities	8
Term of supply agreements, minimum	2 years
Term of supply agreements, maximum	5 years
Sealy Canada
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%
Variable Interest Entity, Primary Beneficiary | Comfort Revolution
Business Acquisition [Line Items]
Equity method investment, ownership percentage	45.00%