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Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Land and coal interests	$ 2,577.8	$ 4,022.4
Buildings and improvements	459.3	547.9
Machinery and equipment	1,330.6	1,518.6
Less: Accumulated depreciation, depletion and amortization	(1,189.3)	(1,409.8)
Property, plant, equipment and mine development, net	$ 3,178.4	$ 4,679.1

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Land and coal interests.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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