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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table shows a summary of the performance stock units as of December 31, 2015:

Performance Period	Minimum Shares		Target Shares		Maximum Shares
2013 – 2015		0		80,468		120,702
2014 – 2016		0		93,490		140,235
2015 – 2017		0		218,063		436,126

Summary of Status and Activity of Non-Vested Stock Awards

The following table shows a summary of the status and activity of non-vested stock awards for the year ended December 31, 2015:

	Restricted Stock Units			Performance Stock Units			Total Stock Units			Weighted Average Grant Date Fair Value per Unit
Non-vested at January 1, 2015		148,906			280,381			429,287		$	39.31
Granted		141,775			223,684			365,459		$	18.20
Credited from dividends		4,298			5,970			10,268		$	37.75
Vested		(66,802	)		0			(66,802	)	$	37.97
Forfeited		(14,969	)		(112,636	)		(127,605	)	$	36.95
Non-vested at December 31, 2015		213,208			397,399			610,607		$	27.29

Stock Options Fair Value Assumptions

The fair value of stock options on the date of grant is calculated using the Black-Scholes-Merton model and the assumptions listed below:

	March 2015 Grant			February 2014 Grant			February 2013 Grant
Grant date price per share of stock option award	$	17.57		$	37.93		$	42.76
Expected dividend yield per share		3.40	%		2.75	%		2.75	%
Expected life in years		5.75			6.5			6.5
Expected volatility		42.27	%		52.14	%		53.77	%
Risk-free interest rate		1.73	%		1.98	%		1.29	%
Grant date fair value per share of option awards	$	5.20		$	15.26		$	17.28

Summary of Status and Activity of Stock Options

The following table shows a summary of the status and activity of stock options for the year ended December 31, 2015:

	Options			Weighted Average Exercise Price per Option		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2014		448,812		$	36.58
Granted		330,159		$	17.57
Forfeited		(4,722	)	$	39.23
Outstanding at December 31, 2015		774,249		$	28.46		6.74	$	0.3
Exercisable at December 31, 2015		333,697		$	35.36		3.92	$	0.1

Schedule of Stock-based Compensation Expense Recognized and Cash Received from Exercise of Stock Options

Total stock-based compensation expense recognized and cash received from the exercise of stock options for the three years ended December 31, 2015 is as follows:

	Year Ended December 31,
	2015		2014		2013
(Dollars in millions)
Stock-based compensation expense recognized:
Selling, general and administrative expenses	$	3.8	$	4.7	$	4.3
Less related income tax benefit		1.5		1.9		1.7
Decrease in net income attributable to Koppers	$	2.3	$	2.8	$	2.6
Cash received from the exercise of stock options	$	0.0	$	0.7	$	0.2