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Stock Based Compensation and Other Incentive Compensation | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Payment and Other Incentive Payment Arrangements [Text Block] | 10. STOCK-BASED COMPENSATION AND OTHER INCENTIVE COMPENSATION STOCK-BASED COMPENSATION At December 31, 2019, we had stock-based awards outstanding under stock compensation plans approved by our stockholders. Under these plans, shares have been authorized for issuance to our directors, officers and certain other associates in the form of unvested restricted stock units, performance shares or other awards that are based on the value of our common stock. Shares available for future grants at December 31, 2019 were 5.3 million. The current stock plan will expire in May 2028. RESTRICTED STOCK UNITS We have awarded restricted stock units (RSUs). Compensation expense associated with RSUs settled in stock is recorded to paid-in-capital ratably over the three-year vesting period. The following table summarizes activity relating to our RSUs:
|  |  | Weighted-Average
| Number of |  | Grant Date Fair
| Shares/Units |  | Value per Share/Unit
| (in millions, except per share data)
Outstanding at January 1, 2017 | 1.8 |  |  | $ | 18.70 |
Granted | 1.3 |  |  | 18.09 |
Vested | (0.4 | ) |  | 19.70 |
Canceled | (0.2 | ) |  | 16.79 |
Outstanding at December 31, 2017 | 2.5 |  |  | $ | 18.35 |
Granted | 1.7 |  |  | 14.57 |
Vested | (0.4 | ) |  | 24.16 |
Canceled | (0.3 | ) |  | 15.84 |
Outstanding at December 31, 2018 | 3.5 |  |  | $ | 16.00 |
Granted | 1.0 |  |  | 15.78 |
Vested | (0.7 | ) |  | 15.53 |
Canceled | (0.7 | ) |  | 16.05 |
Outstanding at December 31, 2019 | 3.1 |  |  | $ | 16.03 |
As of December 31, 2019, unrecognized compensation cost related to unvested RSUs totaled $17.0 million. The weighted average period over which this cost is expected to be recognized is approximately 2 years. In 2019 and 2018, the total fair market value of RSUs vested was $10.9 million and $6.1 million, respectively. PERFORMANCE SHARES As of December 31, 2019, we have performance shares (PS) outstanding under our 2018 Omnibus Incentive Plan. We grant performance shares payable in stock to officers which vest in full over a three-year performance period. In 2019, these grants were based on a total shareholder return (TSR) measure, and in 2018, these grants were based equally on a TSR measure, and AAM's three-year cumulative free cash flow. In 2017, these grants were based equally on a TSR measure and AAM's three-year adjusted earnings before interest, taxes, depreciation and amortization (EBITDA) margin. The TSR metric compares our TSR over the three-year performance period relative to the TSR of our pre-defined competitor peer group. Based on these EBITDA, free cash flow and relative TSR performance metrics, the number of performance shares that will vest will be between 0% and 200% of the grant date amount. Share price appreciation and dividends paid are measured over the performance period to determine TSR. As these awards are settled in stock, the compensation expense is recorded ratably over the vesting period to paid-in-capital. The following table summarizes activity relating to our performance shares:
|  |  | Weighted Average
| Number of |  | Grant Date Fair
| Shares |  | Value per Share
EBITDA Awards | (in millions, except per share data)
Outstanding at January 1, 2017 | 0.5 |  |  | $ | 30.19 |
Granted | 0.2 |  |  | 39.01 |
Vested | (0.1 | ) |  | 27.73 |
Canceled | — |  |  | — |
Outstanding at December 31, 2017 | 0.6 |  |  | $ | 33.91 |
Granted | — |  |  | — |
Vested | (0.1 | ) |  | 37.67 |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.5 |  |  | $ | 34.49 |
Granted | — |  |  | — |
Vested | (0.4 | ) |  | 31.21 |
Canceled | — |  |  | — |
Outstanding at December 31, 2019 | 0.1 |  |  | $ | 39.09 |
TSR Awards |  |  |
Outstanding at January 1, 2017 | 0.5 |  |  | $ | 19.55 |
Granted | 0.2 |  |  | 24.58 |
Vested | (0.1 | ) |  | 22.78 |
Canceled | — |  |  | — |
Outstanding at December 31, 2017 | 0.6 |  |  | $ | 20.93 |
Granted | 0.3 |  |  | 13.91 |
Vested | (0.1 | ) |  | 31.21 |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.8 |  |  | $ | 16.25 |
Granted | 0.3 |  |  | 24.36 |
Vested | (0.2 | ) |  | 17.54 |
Canceled | (0.1 | ) |  | 20.49 |
Outstanding at December 31, 2019 | 0.8 |  |  | $ | 20.13 |
Free Cash Flow Awards |  |  |
Outstanding at January 1, 2018 | — |  |  | $ | — |
Granted | 0.3 |  |  | 14.28 |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2018 | 0.3 |  |  | $ | 14.28 |
Granted | — |  |  | — |
Vested | — |  |  | — |
Canceled | — |  |  | — |
Outstanding at December 31, 2019 | 0.3 |  |  | $ | 14.28 |
We estimate the fair value of our EBITDA performance shares on the date of grant using our estimated three-year adjusted EBITDA margin, based on AAM's budget and long-range plan assumptions at that time, and adjust quarterly as necessary. We estimate the fair value of our TSR performance shares on the date of grant using the Monte Carlo simulation approach. The Monte Carlo simulation approach utilizes inputs on volatility assumptions, risk free rates, the price of the Company’s and our competitor peer group's common stock and their correlation as of each valuation date. Volatility assumptions are based on historical and implied volatility measurements. We estimate the fair value of our free cash flow performance shares on the date of grant using our estimated three-year cumulative free cash flow, based on AAM's budget and long-range plan assumptions at the time, and adjust quarterly as necessary. Based on the current fair value, the estimated unrecognized compensation cost related to unvested PS totaled $6.8 million, as of December 31, 2019. The weighted-average period over which this cost is expected to be recognized is approximately two years. OTHER INCENTIVE COMPENSATION PERFORMANCE UNITS As of December 31, 2019, we have performance units (PU) outstanding under our 2018 Omnibus Incentive Plan. We grant PU payable in cash to officers and certain other associates which vest in full over a three-year performance period. These liability classified awards are incentive compensation as they are based on AAM's three-year cumulative free cash flow and are not indexed to or impacted by our share price. The $14.2 million of PU granted during 2019 will vest for officers between 0% and 200% of the grant date amount, and for other associates between 0% and 150% of the grant date amount, using our cumulative free cash flow performance metric. Based on the current fair value, the estimated unrecognized compensation cost related to unvested PU totaled $6.3 million, as of December 31, 2019. The weighted-average period over which this cost is expected to be recognized is approximately two years.

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