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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jul. 14, 2016
May 24, 2016
Dec. 31, 2015
Sep. 30, 2015
2020 Senior Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Stated percentage     6.875% 6.875%  
2020 Senior Notes | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notes, fair value $ 0.0     $ 393.8  
2023 Senior Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Stated percentage 5.625%     5.625%  
2023 Senior Notes | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notes, fair value $ 477.0     $ 453.4  
2026 Senior Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Stated percentage 5.50%   5.50%    
2026 Senior Notes | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notes, fair value $ 618.0     $ 0.0  
8.0% Sealy Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Stated percentage 8.00% 8.00%   8.00% 8.00%
8.0% Sealy Notes | Fair Value, Inputs, Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notes, fair value $ 0.0     $ 112.7