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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Total Share-based Incentive Compensation Expense | The table below shows our total share-based incentive compensation expense:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Total share-based incentive compensation expense(1) |  | $ | 10.6 |  |  | $ | 12.3 |  |  | $ | 34.4 |  |  | $ | 31.3 |
(1)The amounts presented above do not include the expense related to our U.S. profit sharing contributions made in the form of our common stock, 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 target number of PSUs granted and the grant date fair value of the PSUs are shown in the following table:
|  | Adjusted EBITDA CAGR |  | ROIC
February 10, 2021 grant date |  |  |  |
Number of units granted |  | 41,729 |  |  | 41,729 |
Fair value on grant date (per unit) |  | $ | 45.26 |  |  | $ | 45.26 |
February 11, 2021 grant date |  |  |  |
Number of units granted |  | 51,882 |  |  | 51,882 |
Fair value on grant date (per unit) |  | $ | 43.85 |  |  | $ | 43.85 |
March 1, 2021 grant date |  |  |  |
Number of units granted |  | 29,762 |  |  | 29,762 |
Fair value on grant date (per unit) |  | $ | 43.02 |  |  | $ | 43.02 |
Summary of Assumptions Used to Calculate the Grant Date Fair Value | The assumptions used to calculate the grant date fair value of the PSUs are shown in the following table:
| February 10, 2021 grant date | February 11, 2021 grant date | March 1, 2021 grant date
Expected price volatility | 37.7 | % | 37.7 | % | 38.0 | %
Risk-free interest rate | 0.2 | % | 0.2 | % | 0.3 | %

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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=120381028&loc=d3e5070-113901 + Details
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