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Acquisition of Shoal Creek Mine (Tables)

3 Months Ended

Mar. 31, 2019

Acquisition of Shoal Creek Mine [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The following table summarizes the preliminary estimated fair values of assets acquired and liabilities assumed that were recognized at the acquisition and control date (in millions):

Inventories	$	39.7
Property, plant, equipment and mine development	364.7
Current liabilities	(4.1		)
Asset retirement obligations	(10.5		)
Total purchase price	$	389.8

Business Acquisition, Pro Forma Information [Table Text Block]

The unaudited pro forma financial information does not necessarily reflect the results of operations that would have occurred had the operations of the Company and Shoal Creek Mine been combined during those periods or that may be attained in the future.

		Three Months Ended March, 31, 2018
		(Dollars in millions, except per share data)
Revenues		$	1,567.7
Income from continuing operations, net of income taxes		251.2
Basic earnings per share from continuing operations		$	1.17
Diluted earnings per share from continuing operations		$	1.15

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- Definition

Acquisition of Shoal Creek Mine [Abstract]

+ References

No definition available.

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- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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- Definition

Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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