Equity Method Investments (Tables)

9 Months Ended

Sep. 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 September 30,					Nine Months Ended September 30,
	2019			2018		2019			2018
	(Dollars in millions)
Depreciation, depletion and amortization and asset retirement obligation expenses	$	8.2		$	3.7	$	15.3		$	11.8
Net interest expense	2.4			2.8		6.4			10.0
Income tax (benefit) provision	(7.5		)	3.9		(1.6		)	15.4