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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 24, 2015
Dec. 31, 2014
2023 Senior Notes      
Liabilities, Fair Value Disclosure [Abstract]      
Senior notes $ 450.0 $ 450.0 $ 0.0
Notes, fair value $ 450.6    
Stated percentage 5.625% 5.625% 0.00%
2020 Senior Notes      
Liabilities, Fair Value Disclosure [Abstract]      
Senior notes $ 375.0   $ 375.0
Notes, fair value $ 397.5   $ 398.4
Stated percentage 6.875%   6.875%
Sealy notes      
Liabilities, Fair Value Disclosure [Abstract]      
Notes, fair value $ 114.1   $ 110.7
Stated percentage 8.00%   8.00%
Fair Value, Measurements, Recurring      
Assets, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts $ 9.7   $ 1.8
Assets, Fair Value 9.7   1.8
Liabilities, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 0.6   0.1
Notes, fair value 0.6   0.1
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts     0.0
Assets, Fair Value 0.0   0.0
Liabilities, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 0.0   0.0
Notes, fair value 0.0   0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)      
Assets, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 9.7   1.8
Assets, Fair Value 9.7   1.8
Liabilities, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 0.6   0.1
Notes, fair value 0.6   0.1
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)      
Assets, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 0.0   0.0
Assets, Fair Value 0.0   0.0
Liabilities, Fair Value Disclosure [Abstract]      
Foreign exchange forward contracts 0.0   0.0
Notes, fair value $ 0.0   $ 0.0