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Acquisitions and Divestitures (Details)
$ in Millions
 3 Months Ended 9 Months Ended
May. 06, 2015
USD ($)
Jul. 01, 2014
USD ($)
Jun. 30, 2014
USD ($)
facility
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from disposition of business and other         $ 7.2 $ 43.5
Japanese Third Party            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Acquisition cost   $ 8.5        
Portland Manufacturing Facility            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from disposition of business and other $ 7.2          
Gain (loss) on disposal         $ 0.4  
U.S. Innerspring            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain (loss) on disposal           (23.2)
Number of divestitures | facility     3      
Total consideration     $ 47.8 $ 45.0   $ 45.0
Noncash consideration     1.5      
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Working Capital Adjustment       $ 2.8    
Assets of disposal group     66.8      
Transaction costs     $ 1.4