Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Compensation Expense

Stock-Based Compensation

Stock-based compensation cost by award type follows:

(in millions)	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Stock option awards	$	3.2	$	1.8	$	7.8	$	5.3
Restricted stock awards	2.3		1.3		6.4		3.9
Performance share awards	2.2		1.4		6.1		4.0
Restricted stock units	—		—		1.4		1.4
Total stock-based compensation cost	$	7.7	$	4.5	$	21.7	$	14.6

In the second quarter of 2018, the Company announced a stock option grant to U.S. employees and a stock appreciation right grant to employees outside the U.S. This grant contributed $1.1 million to stock-based compensation cost for the three and nine months ended September 30, 2018. Consistent with the Company's inventory accounting policy, $0.5 million of compensation cost was capitalized as inventory and will be recognized in the Consolidated Statements of Income when that related inventory is sold.

Additionally, the Company recognized accelerated stock-based compensation cost from the retirement of certain executives of $1.7 million and $4.3 million for the three and nine months ended September 30, 2018, respectively. The Company recognized $0.3 million of accelerated stock-based compensation cost for the nine months ended September 30, 2017, none of which related to the third quarter of 2017.