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Stock-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted		0
Share-based Compensation Expense	$ 6.9		$ 9.2	$ 19.8	$ 30.0
HEP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	0.6		$ 0.5	1.5	$ 1.8
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				3.6
Total unrecognized compensation cost related to non-vested grants	16.6			$ 16.6
Total unrecognized compensation cost, weighted-average period of recognition, years				1 year
Performance Shares [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				$ 0.5
Total unrecognized compensation cost related to non-vested grants	$ 7.7			$ 7.7
Total unrecognized compensation cost, weighted-average period of recognition, years				1 year 3 months 18 days