Comprehensive Income and Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of Comprehensive Income

Total comprehensive (loss) income for the three months ended March 31, 2020 and 2019 is summarized in the table below:

	Three Months Ended March 31,
	2020			2019
(Dollars in millions)
Net (loss) income	$	(2.5	)	$	12.5
Changes in other comprehensive (loss) income:
Currency translation adjustment		(23.3	)		1.8
Unrealized (loss) gain on cash flow hedges, net    of tax benefit (expense) of $11.3 and $(2.8)		(25.4	)		6.2
Unrecognized pension net loss, net of tax    (expense) of $(0.1)		0.2			0.2
Total comprehensive (loss) income		(51.0	)		20.7
Comprehensive (loss) income attributable to    noncontrolling interests		(1.3	)		1.1
Comprehensive (loss) income attributable to Koppers	$	(49.7	)	$	19.6

Schedule of Change in Equity

The following tables present the change in equity for the three months ended March 31, 2020 and 2019, respectively:

(Dollars in millions)	Common Stock		Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive (Loss)			Treasury Stock			Noncontrolling Interests			Total Equity
Balance at December 31,   2019	$	0.2	$	221.9	$	93.8		$	(77.7	)	$	(90.9	)	$	11.4		$	158.7
Net loss		0.0		0.0		(1.4	)		0.0			0.0			(1.1	)		(2.5	)
Issuance of common stock		0.0		0.2		0.0			0.0			0.0			0.0			0.2
Employee stock plans		0.0		2.5		0.0			0.0			0.0			0.0			2.5
Other comprehensive (loss) income
Currency translation       adjustment		0.0		0.0		0.0			(23.2	)		0.0			(0.2	)		(23.3	)
Unrealized loss on       cash flow hedges		0.0		0.0		0.0			(25.4	)		0.0			0.0			(25.4	)
Unrecognized pension       net loss		0.0		0.0		0.0			0.2			0.0			0.0			0.2
Repurchases of common   stock		0.0		0.0		0.0			0.0			(1.2	)		0.0			(1.2	)
Balance at March 31, 2020	$	0.2	$	224.7	$	92.4		$	(126.1	)	$	(92.1	)	$	10.1		$	109.2

(Dollars in millions)	Common Stock		Additional Paid-In Capital			Retained Earnings		Accumulated Other Comprehensive (Loss)			Treasury Stock			Noncontrolling Interests		Total Equity
Balance at December 31,   2018	$	0.2	$	206.0		$	27.2	$	(87.2	)	$	(90.0	)	$	10.8	$	67.0
Net income		0.0		0.0			11.6		0.0			0.0			0.9		12.5
Issuance of common stock		0.0		0.3			0.0		0.0			0.0			0.0		0.3
Employee stock plans		0.0		2.9			0.0		0.0			0.0			0.0		2.9
Other comprehensive income
Currency translation       adjustment		0.0		0.0			0.0		1.5			0.0			0.3		1.8
Unrealized gain on       cash flow hedges		0.0		0.0			0.0		6.2			0.0			0.0		6.2
Unrecognized pension       net loss		0.0		0.0			0.0		0.2			0.0			0.0		0.2
Repurchases of common   stock		0.0		(0.2	)		0.1		0.1			(0.8	)		0.0		(0.8	)
Balance at March 31, 2019	$	0.2	$	209.0		$	38.9	$	(79.2	)	$	(90.8	)	$	12.0	$	90.1