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Business Segment Information - Segment Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Segment assets, excluding income tax receivable	$ 1,607.9	$ 1,751.6
Income tax receivable	5.5	2.2
Total assets	1,613.4	1,753.8
Corporate and Other
Segment Reporting Information [Line Items]
Segment assets, excluding income tax receivable	31.8	102.0
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Segment assets, excluding income tax receivable	1,358.9	1,434.2
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Segment assets, excluding income tax receivable	17.7	14.6
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Segment assets, excluding income tax receivable	$ 199.5	$ 200.8

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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