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Stock-Based Compensation (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Petroleum_Refineries
shares
Jun. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Share-based Compensation Plans | Petroleum_Refineries     2  
Share-based Compensation Expense $ 6.1 $ 6.8 $ 12.5 $ 12.2
HEP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Expense $ 0.9 $ 0.8 $ 1.8 $ 1.7
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares     2,999  
Total unrecognized compensation cost, weighted-average period of recognition, years     1 year 4 months 2 days  
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement Vesting Period     1 year  
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement Vesting Period     3 years  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost, weighted-average period of recognition, years     1 year 6 months  
Performance Shares [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement Vesting Period     3 years