Stock-Based Compensation

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Stock-based compensation cost by award type follows:


(in millions)	Three Months Ended September 30,									Nine Months Ended September 30,
			2019			2018			2019			2018
Stock option awards	$	2.6		$	3.2		$	8.2		$	7.8
Restricted stock awards	1.7			2.3			5.8			6.4
Performance share awards	1.4			2.2			4.5			6.1
Restricted stock units	—			—			1.3			1.4
Stock appreciation rights	2.1			—			5.0			—
Total stock-based compensation cost	$	7.8		$	7.7		$	24.8		$	21.7

In 2018, the Board authorized a grant of stock options to U.S. employees and stock appreciation rights to employees outside of the U.S. This grant contributed $2.8 million and $7.3 million to stock-based compensation cost for the three and nine months ended September 30, 2019, respectively, and $1.1 million to stock-based compensation cost for the three and nine months ended September 30, 2018. As of September 30, 2019, compensation cost of $1.9 million was capitalized as inventory and will be recognized in costs of goods sold when that related inventory is sold.