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Long-Term Debt - 2021 Notes (Details) - Senior Notes - 6.5% Senior Notes due 2021 - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Stated interest rate 6.50%  
CVR Partners, LP    
Debt Instrument [Line Items]    
Outstanding debt   $ 2.2
Interest payable $ 0.0 $ 0.0