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Stockholders' Equity (Changes To Equity) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Increase (Decrease) in Common Shares Outstanding [Roll Forward]      
Common shares outstanding at January 1 198,830,351us-gaap_CommonStockSharesOutstanding 203,551,496us-gaap_CommonStockSharesOutstanding 209,332,646us-gaap_CommonStockSharesOutstanding
Issuance of restricted stock, excluding restricted stock with performance feature 376,622hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardExcludingPerformanceFeatures 292,855hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardExcludingPerformanceFeatures 691,207hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardExcludingPerformanceFeatures
Vesting of performance units 416,111hfc_StockIssuedDuringPeriodSharesVestingOfPerformanceUnits 210,819hfc_StockIssuedDuringPeriodSharesVestingOfPerformanceUnits 869,231hfc_StockIssuedDuringPeriodSharesVestingOfPerformanceUnits
Vesting of restricted stock with performance feature 77,430hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardPerformanceFeatures 15,141hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardPerformanceFeatures 146,400hfc_StockIssuedDuringPeriodSharesRestrictedStockAwardPerformanceFeatures
Forfeitures of restricted stock (76,107)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited (15,794)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited (3,975)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
Purchase of treasury stock (3,538,317)us-gaap_TreasuryStockSharesAcquired [1] (5,224,166)us-gaap_TreasuryStockSharesAcquired [1] (7,484,013)us-gaap_TreasuryStockSharesAcquired [1]
Common shares outstanding at December 31 196,086,090us-gaap_CommonStockSharesOutstanding 198,830,351us-gaap_CommonStockSharesOutstanding 203,551,496us-gaap_CommonStockSharesOutstanding
[1] Includes 279,680, 235,922 and 560,484 shares, respectively, withheld under the terms of stock-based compensation agreements to provide funds for the payment of payroll and income taxes due at the vesting of share-based awards, as well as other stock repurchases under separate authority from our Board of Directors.