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Fair Value Measurements Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 27, 2017
Jun. 24, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Other Equity Investments, Other than Temporary Impairment   $ 3,000,000    
Senior Notes 5.875% due 2022 | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument interest rate, percent       5.875%
Designated as Hedging Instrument | Interest Rate Swap | Noncurrent Assets        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest Rate Cash Flow Hedge $ 6,000,000      
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative, Notional Amount     $ 500,000,000  
Loss on cash flow hedge 1,000,000 $ 5,000,000    
Expected reclassification of AOCI into Interest Expense $ (1,000,000)