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Acquisition of Shoal Creek Mine (Tables)
 6 Months Ended
Jun. 30, 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 as well as provisional fair value adjustments made through June 30, 2019:
 
Preliminary Allocations
 
Adjustments
 
Updated Allocations
 
(Dollars in millions)
Inventories
$
39.7

 
$
0.4

 
$
40.1

Property, plant, equipment and mine development
364.7

 
3.4

 
368.1

Current liabilities
(4.1
)
 
—

 
(4.1
)
Asset retirement obligations
(10.5
)
 
(3.8
)
 
(14.3
)
Total purchase price
$
389.8

 
$
—

 
$
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 June 30, 2018
 
Six Months Ended June 30, 2018
 
(Dollars in millions, except per share data)
Revenues
$
1,390.0

 
$
2,957.7

Income from continuing operations, net of income taxes
150.7

 
402.1

Basic earnings per share from continuing operations
$
1.19

 
$
2.36

Diluted earnings per share from continuing operations
$
1.17

 
$
2.33