Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Channel Facility	Mar. 31, 2012	Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]
Number of Active Plants	4
Number of Previously Closed U S Facilities	8
Business Acquisition [Line Items]
Aggregate principal amount of borrowing related acquisition to fund purchase price	$ 1,900.0
Number of products sales channels	3
Inventory [Abstract]
Finished goods	112.4		68.5
Work-in-process	10.0		7.9
Raw materials and supplies	48.5		16.6
Total	170.9		93.0
Sales returns [Abstract]
Beginning balance	5.1
Ending balance	25.6
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued expenses	11.7		1.9
Other non-current liabilities	10.1		2.9
Revenue Recognition [Abstract]
Allowance for doubtful accounts included in accounts receivable, net	22.5		8.2
Research and Development Expenses {Abstract]
Research and development costs charged to expense	4.8	3.4
Minimum [Member]
Standard product warranty disclosure [Abstract]
International sales warranty period	10 years
Warranty period on pillows	2 years
Maximum [Member]
Standard product warranty disclosure [Abstract]
International sales warranty period	25 years
Warranty period on pillows	3 years
Sales Returns [Member]
Sales returns [Abstract]
Beginning balance	5.1
Amounts accrued	14.9
Liabilities assumed as result of acquisition	19.9
Returns charged to accrual	(14.3)
Ending balance	25.6
Movement in Standard Product Warranty Accrual [Roll Forward]
Liabilities assumed as a result of acquisition	19.9
Warrant [Member]
Sales returns [Abstract]
Liabilities assumed as result of acquisition	16.9
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	4.8
Amounts accrued	2.0
Liabilities assumed as a result of acquisition	16.9
Warranties charged to accrual	(1.9)
Ending balance	$ 21.8
Sealy Canada [Member]
Business Acquisition [Line Items]
Percentage of owned subsidiary (in hundredths)	100.00%
Comfort Revolution [Member]
Business Acquisition [Line Items]
Percentage of owned subsidiary (in hundredths)	45.00%