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Share-Based Compensation - Long-Term Incentive Plan, CVR Partners (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Share-Based Compensation        
Personnel accruals $ 27.7     $ 55.9
CVR Partners Long Term Incentive Plan | CVR Partners, LP        
Share-Based Compensation        
Common stock authorized for issuance (in shares) 5,000,000      
Common stock available for issuance (in shares) 4,820,215      
Number of share right to receive cash payment on vesting equal to fair market value is received per award (in shares) 1      
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Units        
Share-Based Compensation        
Vesting period 3 years      
Unrecognized compensation expense $ 2.4      
Weighted-average period for amortization of unrecognized compensation cost 1 year 6 months      
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Units | Tranche One        
Share-Based Compensation        
Vesting rights percentage 33.33%      
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Units | Tranche Two        
Share-Based Compensation        
Vesting rights percentage 33.33%      
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Units | Tranche Three        
Share-Based Compensation        
Vesting rights percentage 33.33%      
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Unit and Common Units        
Share-Based Compensation        
Compensation expense (benefit)   $ 0.4 $ 0.3  
CVR Partners Long Term Incentive Plan | CVR Partners, LP | Phantom Unit and Common Units | Personnel Accruals        
Share-Based Compensation        
Personnel accruals $ 1.1     $ 0.7