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Customer Concentrations (Tables)

12 Months Ended

Dec. 31, 2020

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor

The tables below shows sales to the Company's significant customers:

						Year Ended December 31,
						2020
						Sales and other operating revenue						Percent of Company sales and other operating revenue
						(Dollars in millions)
Cliffs Steel / AM USA(1)(2)						$	687.3					51.6		%
Cliffs Steel / AK Steel(1)(2)						$	355.8					26.7		%
U.S. Steel(3)						$	208.2					15.6		%

						Years Ended December 31,
															2019																		2018
															Sales and other operating revenue						Percent of Company sales and other operating revenue												Sales and other operating revenue						Percent of Company sales and other operating revenue
						(Dollars in millions)
AM USA(2)															$	786.4					49.1		%										$	695.6					47.9		%
AK Steel(2)															$	433.3					27.1		%										$	377.9					26.0		%
U.S. Steel(3)															$	255.4					16.0		%										$	206.8					14.3		%

(1)Combined sales to Cliffs Steel/AM USA and Cliffs Steel/AK Steel were $1,043.1 million, or 78.3 percent of total Company sales and other operating revenue for the year ended December 31, 2020.

(2)Represents revenues included in our Domestic Coke segment.

(3)Represents revenues included in our Domestic Coke and Logistics segments.

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- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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