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Segment Information - Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information, Additional Information [Abstract]
Assets	$ 4,948.8	$ 6,542.8
Property, plant, equipment and mine development, net	3,178.4	4,679.1
Operating lease right-of-use assets	50.7	82.4
Seaborne Mining
Segment Reporting Information, Additional Information [Abstract]
Assets	1,748.4	2,001.3
Property, plant, equipment and mine development, net	1,347.9	1,610.9
Operating lease right-of-use assets	27.0	32.1
U.S. Thermal Mining
Segment Reporting Information, Additional Information [Abstract]
Assets	1,470.9	3,044.8
Property, plant, equipment and mine development, net	1,297.9	2,776.9
Operating lease right-of-use assets	5.5	30.3
Corporate and Other
Segment Reporting Information, Additional Information [Abstract]
Assets	1,729.5	1,496.7
Property, plant, equipment and mine development, net	532.6	291.3
Operating lease right-of-use assets	$ 18.2	$ 20.0

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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X

- Definition

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.

+ References

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-Name Accounting Standards Codification
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