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Subsequent Events (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 16, 2019
Jan. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]        
Maximum borrowing capacity     $ 800,000,000.0 $ 800,000,000
Leverage ratio, max     65.00%  
Subsequent Event        
Subsequent Event [Line Items]        
Maximum borrowing capacity   $ 1,200,000,000    
Elite Comfort Solutions, Inc. | Subsequent Event        
Subsequent Event [Line Items]        
Purchase price $ 1,250,000,000      
Term Loan Facility | Subsequent Event        
Subsequent Event [Line Items]        
Long-term debt   $ 500,000,000    
Maturities (term)   5 years    
Leverage ratio, max   425.00%    
Leverage ratio, minimum   350.00%