Partners' Equity, Income Allocations and Cash Distributions - Issuances (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Partners' Capital [Abstract]
Limited Partners' Capital Account, Distribution Amount	$ 37.0	$ 68.5	$ 105.9	$ 205.2
Common units held by HFC (in shares)	59,630,030		59,630,030
Ownership percentage, controlling interest	57.00%		57.00%
Common Unit Issuance Program			$ 200.0
Partners' capital account, units, sale of units (in shares)			2,413,153
Gross proceeds from issuance of common units			$ 82.3
Dividends Payable, Amount Per Share	$ 0.35		$ 0.35

Common Unit Issuance Program

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- Definition

Ownership Percentage by Parent, Controlling Interest

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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- Definition

The total amount of distributions to limited partners.

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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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The cash inflow from the additional capital contribution to the entity.

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