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Stock-Based Compensation | 9 Months Ended
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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.

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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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