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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 14, 2016
Jul. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
May 24, 2016
Dec. 31, 2015
Debt Instrument [Line Items]                
Debt issuance costs     $ 11,300,000   $ 11,300,000     $ 24,800,000
Loss on extinguishment of debt     47,200,000 $ 0 47,200,000 $ 0    
Write off of deferred financing costs     11,000,000          
Proceeds from borrowings under long-term debt obligations         1,435,300,000 $ 283,000,000    
2016 Credit Agreement                
Debt Instrument [Line Items]                
Debt issuance costs     $ 3,600,000   3,600,000      
Debt instrument, amortization period, deferred financing costs (in years)     5 years          
Loss on extinguishment of debt     $ 1,900,000          
Delayed Draw Term Loan Facility | 2016 Credit Agreement | Subsequent Event | Line of Credit                
Debt Instrument [Line Items]                
Proceeds from borrowings under long-term debt obligations $ 100,000,000              
2026 Senior Notes                
Debt Instrument [Line Items]                
Senior notes     $ 600,000,000   $ 600,000,000   $ 600,000,000 0
Stated percentage     5.50%   5.50%   5.50%  
Percentage of principal amount that may be redeemed         105.50%      
Minimum Percentage Of Notes Not Eligible For Early Redemption         65.00%      
Debt issuance costs     $ 3,100,000   $ 3,100,000      
Debt instrument, amortization period, deferred financing costs (in years)     10 years          
Loss on extinguishment of debt     $ 5,900,000          
2026 Senior Notes | Any time on or after June 15, 2021                
Debt Instrument [Line Items]                
Redemption Price, Percentage         102.75%      
2026 Senior Notes | Beginning on June 15, 2021                
Debt Instrument [Line Items]                
Redemption Price, Percentage         100.00%      
2026 Senior Notes | Any time prior to June 15, 2021 with a 'make-whole' premium and accrued and unpaid interest, if any                
Debt Instrument [Line Items]                
Percentage of redemption on notes     100.00%   100.00%      
2026 Senior Notes | Any time prior to June 15, 2021 with the net cash proceeds from certain equity offerings plus accrued and unpaid interest, if any                
Debt Instrument [Line Items]                
Redemption Price, Percentage         35.00%      
2020 Senior Notes                
Debt Instrument [Line Items]                
Senior notes     $ 0   $ 0   $ 375,000,000 $ 375,000,000.0
Stated percentage             6.875% 6.875%
Loss on extinguishment of debt         $ 23,600,000      
Write off of deferred financing costs     $ 4,800,000          
Sealy notes                
Debt Instrument [Line Items]                
Stated percentage     8.00%   8.00%     8.00%
Sealy notes | Subsequent Event                
Debt Instrument [Line Items]                
Stated percentage 8.00%              
Amount paid to holders of Sealy notes who properly converted notes   $ 115,000,000