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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	$ 8.1	$ 11.9	$ 12.9	$ 20.8
HEP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	0.5	$ 0.6	1.0	$ 1.2
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			3.5
Total unrecognized compensation cost related to non-vested grants	23.2		$ 23.2
Total unrecognized compensation cost, weighted-average period of recognition, years			1 year 2 months 12 days
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	$ 8.3		$ 8.3
Total unrecognized compensation cost, weighted-average period of recognition, years			1 year 7 months 6 days