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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Senior notes $ 375.0 $ 375.0
Notes, fair value $ 399.4 $ 398.4
Stated percentage 6.875% 6.875%
Sealy notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes, fair value $ 113.0 $ 110.7
Stated percentage 8.00% 8.00%