Stock-Based Compensation

9 Months Ended

Sep. 30, 2020

Stock-based compensation cost by award type follows:


(in millions)	Three Months Ended September 30,									Nine Months Ended September 30,
			2020			2019			2020			2019
Stock option awards	$	2.6		$	2.6		$	8.4		$	8.2
Restricted stock awards	2.1			1.7			6.1			5.8
Performance share awards	1.9			1.4			5.7			4.5
Restricted stock units	—			—			1.4			1.3
Stock appreciation rights	1.1			2.1			(2.8)			5.0
Total stock-based compensation cost incurred	7.7			7.8			18.8			24.8
Capitalized (cost) credit during the period	(1.4)			(2.8)			2.0			(6.6)
Amortization of capitalized (credit) cost during the period	(0.2)			2.9			0.2			5.2
Total stock-based compensation expense	$	6.1		$	7.9		$	21.0		$	23.4