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Stockholders' Deficit (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Total Share-based Incentive Compensation Expense | The table below shows our total share-based incentive compensation expense:
|  | Three Months Ended March 31,
(In millions) |  | 2019 |  | 2018
Total share-based incentive compensation expense(1) |  | $ | 8.4 |  |  | $ | 7.6 |
(1) | The amounts included above do not include the expense related to our U.S. profit sharing contributions made in the form of our common stock or the expense or income related to certain cash-based awards, however, the amounts include the expense related to share based awards that are settled in cash.
Number of PSUs Granted and Grant Date Fair Value of PSUs | The number of PSUs granted and the grant date fair value of the PSUs are shown in the following table:
|  | TSR |  | ROIC |  | Adjusted EBITDA
Number of units granted |  | 49,819 |  |  | 66,807 |  |  | 66,807 |
Fair value on grant date(1) |  | $ | 58.25 |  |  | $ | 42.16 |  |  | $ | 42.16 |
(1) | Represents weighted average fair value for PSU awards approved on February 13, 2019 and February 14, 2019.
Summary of Assumptions Used to Calculate the Grant Date Fair Value | The assumptions used to calculate the grant date fair value of the PSUs based on TSR are shown in the following table:
| TSR portion of the 2019 PSU Award
Expected price volatility(1) | 22.8 | %
Risk-free interest rate(1) | 2.5 | %
(1) | Represents average of assumptions for PSU awards approved on February 13, 2019 and February 14, 2019.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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