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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2019
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 March 31, |  |
|  |  |  |  |  | 2019 |  | 2018
Stock option awards |  |  |  |  |  | $ | 3.1 |  | $ | 2.0
Restricted stock awards |  |  |  |  |  | 2.0 |  | 1.9
Performance share awards |  |  |  |  |  | 1.6 |  | 1.7
Restricted stock units |  |  |  |  |  | 1.3 |  | 1.4
Stock appreciation rights |  |  |  |  |  | 0.8 |  | —
Total stock-based compensation cost |  |  |  |  |  | $ | 8.8 |  | $ | 7.0
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 $1.8 million to stock-based compensation cost for the three months ended March 31, 2019. As of March 31, 2019, c ompensation cost of $0.9 million was capitalized as inventory and will be recognized in costs of goods sold when that related inventory is sold.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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