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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Petroleum_Refineries
$ / shares
shares
Sep. 30, 2016
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 $ 9.1 $ 6.2 $ 24.5 $ 14.8
Stock Issued During Period, Shares, Acquisitions | shares     472,276  
Equity Issued in Business Combination, Fair Value Disclosure $ 13.3   $ 13.3  
Shares Issued, Price Per Share | $ / shares $ 28.12   $ 28.12  
Stock Issued in Acquisition $ 5.1   $ 5.1  
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent 8.2   8.2  
HEP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Expense 0.8 $ 0.7 1.9  
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     1.1  
Total unrecognized compensation cost related to non-vested grants 23.7   $ 23.7  
Total unrecognized compensation cost, weighted-average period of recognition, years     1 year 2 months  
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement Vesting Period     2 years  
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]        
Share-based Compensation Arrangement Vesting Period     3 years  
Total unrecognized compensation cost related to non-vested grants $ 8.6   $ 8.6  
Total unrecognized compensation cost, weighted-average period of recognition, years     1 year 6 months