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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 14, 2016
Jul. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Oct. 18, 2016
May 24, 2016
Dec. 31, 2015
Debt Instrument [Line Items]                    
Debt issuance costs     $ 10,900,000     $ 10,900,000       $ 24,800,000
Loss on extinguishment of debt     0   $ 0 47,200,000 $ 0      
Write off of deferred financing costs     11,000,000              
Proceeds from borrowings under long-term debt obligations           1,871,500,000 $ 855,400,000      
2016 Credit Agreement                    
Debt Instrument [Line Items]                    
Debt issuance costs       $ 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 | 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            
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% 8.00% 8.00%     8.00%
Amount paid to holders of Sealy notes who properly converted notes   $ 115,000,000                
Subsequent Event | 2026 Senior Notes                    
Debt Instrument [Line Items]                    
Senior notes. percent of outstanding notes tendered and received for new 2026 Senior Notes               100.00%