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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The Company’s stock-based compensation expense for the three and six months ended June 30, 2019 and 2018 included performance restricted stock units ("PRSUs"), non-qualified stock options, RSUs and deferred stock units ("DSUs"). A summary of the Company’s stock-based compensation expense is presented in the following table:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
PRSU expense | $ | 0.4 |  |  | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.5 |
Option expense | 1.2 |  |  | 1.9 |  |  | 2.4 |  |  | 3.8 |
RSU/DSU expense | 5.0 |  |  | 4.2 |  |  | 10.1 |  |  | 7.8 |
Total stock-based compensation expense | $ | 6.6 |  |  | $ | 6.8 |  |  | $ | 13.2 |  |  | $ | 13.1 |
The Company grants PRSUs to executive officers and certain members of management. Actual payout under the PRSUs is dependent upon the achievement of certain financial goals. In March 2019, the Compensation Committee of the Board formally determined that the Company did not meet the performance metric of $650.0 million of adjusted earnings before interest, tax, depreciation and amortization ("Adjusted EBITDA") for payout under the PRSUs granted in 2017 (the "2017 Aspirational Plan PRSUs"). As a result, the remaining one-third of the 2017 Aspirational Plan PRSUs previously granted with a performance period for 2018 were forfeited as of this date. At June 30, 2019, the Company had 1.6 million PRSUs granted in 2018 outstanding that will vest if the Company achieves a certain level of Adjusted EBITDA during four consecutive fiscal quarters as described below (the "2019 Aspirational Plan PRSUs"). The 2019 Aspirational Plan PRSUs will vest based on the highest Adjusted EBITDA for any four consecutive fiscal quarter period ending between (and including) March 31, 2018 and December 31, 2019 (the "First Designated Period"). If the highest Adjusted EBITDA in the First Designated Period is $600.0 million, 66% will vest; if the highest Adjusted EBITDA equals or exceeds $650.0 million, then 100% will vest; if the highest Adjusted EBITDA is between $600.0 million and $650.0 million then a pro rata portion will vest; and if the highest Adjusted EBITDA is less than $600.0 million then one-half of the 2019 Aspirational Plan PRSUs will no longer be available for vesting based on performance and the remaining one-half will remain available for vesting based on the highest Adjusted EBITDA in any four consecutive fiscal quarter period ending between (and including) March 31, 2020 and December 31, 2020 (the "Second Designated Period"). If the highest Adjusted EBITDA in the Second Designated Period is $600.0 million then 66% of the remaining 2019 Aspirational Plan PRSUs will vest; if the Adjusted EBITDA is $650.0 million or more 100% will vest; if Adjusted EBITDA is between $600.0 million and $650.0 million then a pro rata portion will vest; and if Adjusted EBITDA is below $600.0 million then all of the remaining 2019 Aspirational Plan PRSUs will be forfeited. Adjusted EBITDA is defined for purposes of the 2019 Aspirational PRSUs as the Company’s "Consolidated EBITDA" as such term is defined in the 2016 Credit Agreement. The Company did not record any stock-based compensation expense related to the 2019 Aspirational Plan PRSUs during the three and six months ended June 30, 2019, as it is not considered probable that the Company will achieve the specified performance target for either the First Designated Period or Second Designated Period. The Company will continue to evaluate the probability of achieving the performance condition in future periods and record the appropriate expense if necessary. Based on the price of the Company’s common stock on the grant date, the total unrecognized compensation expense related to this award if the performance target is met for the First Designated Period is $93.3 million, which would be a non-cash expense over the remaining service period if achievement of the performance condition becomes probable.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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