Equity Method Investments (Tables)

6 Months Ended

Jun. 30, 2019

Equity Method Investment, Summarized Financial Information [Abstract]

Equity Method Investments [Table Text Block]

Middlemount’s standalone results include (on a 50% attributable basis):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	(Dollars in millions)
Depreciation, depletion and amortization and asset retirement obligation expenses	$	3.5	$	4.2	$	7.1	$	8.1
Net interest expense	1.8		3.6		4.0		7.2
Income tax provision	4.2		6.4		5.9		11.5