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Stock-based Compensation Plans | 12 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement [Text Block] | Stock-based Compensation Plans The effect of stock-based compensation on our statements of operations is presented below.
| 2020 |  | 2019 |  | 2018
| (in millions, except per share data)
Decrease in operating income | $ | 7.2 |  |  | $ | 5.5 |  |  | $ | 6.4 |
Decrease in net income | 5.0 |  |  | 4.3 |  |  | 4.0 |
Decrease in earnings per basic share | 0.03 |  |  | 0.03 |  |  | 0.03 |
Decrease in earnings per diluted share | 0.03 |  |  | 0.03 |  |  | 0.03 |
We excluded 267,298, 106,896 and 214,435 instruments from the calculation of diluted earnings per share for 2020, 2019 and 2018, respectively, because the effect of including them would have been antidilutive. At September 30, 2020, there was approximately $7.6 million of unrecognized compensation expense related to stock-based awards not yet vested. We expect to recognize this expense over a weighted average life of approximately 1.49 years. The Mueller Water Products, Inc. 2006 Stock Incentive Plan (“2006 Plan”) authorizes an aggregate of 20,500,000 shares of common stock that may be granted through the issuance of stock-based awards. Any awards canceled are available for reissuance. Generally, all of our employees and members of our board of directors are eligible to participate in the 2006 Plan. At September 30, 2020, 6,575,797 shares of common stock were available for future grants of awards under the 2006 Plan. This total assumes that the maximum number of shares will be earned for awards for which the final number of shares to be earned has not yet been determined. An award granted under the 2006 Plan vests at such times and in such installments as set by the Compensation and Human Resources Committee of the board of directors (“Comp. Committee”), but no award will be exercisable after the 10-year anniversary of the date on which it is granted. Management expects some instruments will be forfeited prior to vesting. Grants to members of our board of the directors are expected to vest fully. Based on historical forfeitures, we expect grants to others to be forfeited at an annual rate of 2%. Restricted Stock Units. Depending on the specific terms of each award, restricted stock units generally vest ratably over the life of the award, usually 3 years, on each anniversary date of the original grant. Compensation expense for restricted stock units is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. Fair values of restricted stock units are determined using the closing price of our common stock on the respective dates of grant. Restricted stock unit activity under the 2006 Plan is summarized below.
| Restricted stock units |  | Weighted average grant date fair value per unit |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (millions)
Outstanding at September 30, 2017 | 625,830 |  |  | $ | 11.23 |  |  | 0.9 |  |
Granted | 276,658 |  |  | 12.20 |  |  |  |  |
Vested | (342,038) |  |  | 10.84 |  |  |  |  | $ | 4.2 |
Cancelled | (78,888) |  |  | 11.41 |  |  |  |  |
Outstanding at September 30, 2018 | 481,562 |  |  | 12.14 |  |  | 1.0 |  |
Granted | 233,830 |  |  | 10.10 |  |  |  |  |
Vested | (259,107) |  |  | 11.75 |  |  |  |  | 2.6 |
Cancelled | (19,263) |  |  | 11.43 |  |  |  |  |
Outstanding at September 30, 2019 | 437,022 |  |  | 11.31 |  |  | 0.9 |  |
Granted | 301,979 |  |  | 11.55 |  |  |  |  |
Vested | (295,241) |  |  | 11.40 |  |  |  |  | 3.4 |
Cancelled | (35,254) |  |  | 11.48 |  |  |  |  |
Outstanding at September 30, 2020 | 408,506 |  |  | 11.41 |  |  | 0.8 |  |
Performance-Based Awards. Our performance-based awards consist of performance-based restricted stock units (“PRSUs”). PRSUs represent a target number of units that may be paid out at the end of a multi-year award cycle consisting of annual performance periods coinciding with our fiscal years. As determined at the date of award, PRSUs may settle in cash-value equivalent of, or directly in, shares of our common stock. Settlement will range from zero to two times the number of PRSUs granted, depending on our financial performance against predetermined targets. The grant date for each year’s performance period is set when the Comp. Committee establishes performance goals for the period, normally within 90 days of the beginning of each performance period. At the end of each annual performance period, the Comp. Committee confirms performance against the applicable performance targets. PRSUs do not convey voting rights or earn dividends. PRSUs vest on the last day of an award cycle, unless vested sooner due to a “Change of Control” of the Company, or the death, disability or Retirement of a participant. We recognize compensation expense for stock-settled PRSUs starting on the first day of the applicable performance period and ending on the respective vesting dates. We base the recognized compensation expense upon the number of units awarded for each performance period, the closing price of our common stock on the grant date and the estimated performance factor. In 2020 and 2019, 93,647 shares and 181,065 shares, respectively, vested related to PRSUs. Stock-settled PRSUs activity under the 2006 Plan is summarized below.
Award date |  | Settlement year |  | Performance period |  | Grant date per unit fair value |  | Units awarded |  | Units forfeited |  | Net units |  | Performance factor |  | Shares earned
December 1, 2015 |  | 2019 |  | 2016 |  | $ | 9.38 |  |  | 77,823 |  |  | (3,998) |  |  | 73,825 |  |  | 1.021 |  | 75,375 |
|  |  |  | 2017 |  | 13.26 |  |  | 77,824 |  |  | (3,997) |  |  | 73,827 |  |  | 1.000 |  | 73,827 |
|  |  |  | 2018 |  | 12.50 |  |  | 77,824 |  |  | (61,841) |  |  | 15,983 |  |  | 1.357 |  | 21,689 |
November 29, 2016 |  | 2020 |  | 2017 |  | 13.26 |  |  | 59,285 |  |  | (5,279) |  |  | 54,006 |  |  | 1.000 |  | 54,006 |
|  |  |  | 2018 |  | 12.50 |  |  | 59,286 |  |  | (39,910) |  |  | 19,376 |  |  | 1.357 |  | 26,294 |
|  |  |  | 2019 |  | 10.53 |  |  | 59,290 |  |  | (39,909) |  |  | 19,381 |  |  | 0.645 |  | 12,501 |
January 23, 2017 |  | 2020 |  | 2017 |  | 13.15 |  |  | 19,012 |  |  | — |  |  | 19,012 |  |  | 1.000 |  | 19,012 |
|  |  |  | 2018 |  | 12.50 |  |  | 19,011 |  |  | — |  |  | 19,011 |  |  | 1.357 |  | 25,798 |
|  |  |  | 2019 |  | 10.53 |  |  | 19,011 |  |  | — |  |  | 19,011 |  |  | 0.645 |  | 12,263 |
November 28, 2017 |  | 2021 |  | 2018 |  | 12.50 |  |  | 57,092 |  |  | — |  |  | 57,092 |  |  | 1.357 |  | 77,474 |
|  |  |  | 2019 |  | 10.53 |  |  | 57,092 |  |  | (4,793) |  |  | 52,299 |  |  | 0.645 |  | 33,733 |
|  |  |  | 2020 |  | 11.26 |  |  | 57,104 |  |  | (21,679) |  |  | 35,425 |  |  | 0.909 |  | 32,202 |
November 27, 2018 |  | 2022 |  | 2019 |  | 10.53 |  |  | 110,954 |  |  | (8,751) |  |  | 102,203 |  |  | 0.645 |  | 65,921 |
|  |  |  | 2020 |  | 11.26 |  |  | 110,954 |  |  | (13,182) |  |  | 97,772 |  |  | 0.909 |  | 88,875 |
|  |  |  | 2021 |  |  |  | 110,967 |  |  | (26,484) |  |  | 84,483 |  |  |  |  |
December 3, 2019 |  | 2023 |  | 2020 |  | 11.26 |  |  | 69,988 |  |  | (2,747) |  |  | 67,241 |  |  | 0.909 |  | 61,123 |
|  |  |  | 2021 |  |  |  | 69,989 |  |  | (9,970) |  |  | 60,019 |  |  |  |  |
|  |  |  | 2022 |  |  |  | 69,989 |  |  | (9,970) |  |  | 60,019 |  |  |  |  |
Market-Based Awards. Our market-based awards consist of market-based restricted stock units (“MRSUs”). MRSUs represent a target number of units that may be paid out at the end of a three-fiscal year award cycle based on a calculation of our relative total shareholder return (“TSR”) performance as compared with the TSRs of a selected peer group. Settlements in our common shares, will range from zero to two times the number of MRSUs granted, depending on our TSR performance ranking within the peer group. The fair values of MRSUs are fixed at the date of grant and the related expense is recognized ratably over the vesting period, which is roughly three years from the date of grant. The table below provides information regarding MRSU awards, which were valued using Monte Carlo simulations on the dates the units were granted.
| December 3, 2019 |  | January 28, 2020 |  | February 24, 2020
Fair value at grant date | $ | 14.94 |  |  | $ | 16.76 |  |  | $ | 18.17 |
Units granted | 147,213 |  |  | 2,763 |  |  | 7,498 |
Variables used in determining grant date fair value: |  |  |  |  |
Dividend yield | 1.87 | % |  | 1.76 | % |  | 1.73 | %
Risk-free rate | 1.53 | % |  | 1.44 | % |  | 1.23 | %
Expected term (in years) | 2.83 |  | 2.67 |  | 2.60
Stock Options. Stock options generally vest ratably over 3 years on each anniversary date of the original grant. Stock options granted since November 2007 also vest upon the Retirement of a participant. Compensation expense for stock options is recognized between the grant date and the vesting date (or the date on which a participant becomes Retirement-eligible, if sooner) on a straight-line basis for each tranche of each award. No stock options were granted since 2015. Stock option activity under the 2006 Plan is summarized below.
| Options |  | Weighted average exercise price per option |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (millions)
Outstanding at September 30, 2017 | 2,440,654 |  |  | $ | 5.72 |  |  | 2.5 |  | $ | 17.3 |
Exercised | (851,628) |  |  | 7.00 |  |  |  |  | 3.8 |
Cancelled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2018 | 1,589,026 |  |  | 5.03 |  |  | 1.9 |  | 10.3 |
Exercised | (726,636) |  |  | 5.20 |  |  |  |  | 4.4 |
Cancelled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2019 | 862,390 |  |  | 4.89 |  |  | 2.0 |  | 5.5 |
Exercised | (534,291) |  |  | 4.15 |  |  |  |  | 3.3 |
Cancelled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2020 | 328,099 |  |  | $ | 6.11 |  |  | 2.3 |  | $ | 1.4 |
Exercisable at September 30, 2020 | 328,099 |  |  | $ | 6.11 |  |  | 2.3 |  | $ | 1.4 |
Stock option exercise prices are equal to the closing price of our common stock on the relevant grant date. The ranges of exercise prices for stock options outstanding at September 30, 2020 are summarized below.
Exercise price |  | Options |  | Weighted average exercise price |  | Weighted average remaining contractual term (years) |  | Exercisable options |  | Weighted average exercise price
| $ | 0.00 |  | - | $ | 4.99 |  |  |  | 129,949 |  |  | $ | 3.19 |  |  | 0.8 |  | 129,949 |  |  | $ | 3.19 |
| $ | 5.00 |  | - | $ | 9.99 |  |  |  | 198,150 |  |  | 8.02 |  |  | 3.3 |  | 198,150 |  |  | 8.02 |
|  |  |  |  |  | 328,099 |  |  | $ | 6.11 |  |  | 2.3 |  | 328,099 |  |  | $ | 6.11 |
Employee Stock Purchase Plan. The Mueller Water Products, Inc. 2006 Employee Stock Purchase Plan (“ESPP”) authorizes the sale of up to 5,800,000 shares of our common stock to employees. Generally, all full-time, active employees are eligible to participate in the ESPP, subject to certain restrictions. Employee purchases are funded through payroll deductions, and any excess payroll withholdings are returned to the employee. The price for shares purchased under the ESPP is 85% of the lower of the closing price on the first day or the last day of the offering period. At September 30, 2020, 2,400,158 shares were available for issuance under the ESPP. Phantom Plan. Under the Mueller Water Products, Inc. Phantom Plan adopted in 2012 (“Phantom Plan”), we have awarded “phantom units” to certain non-officer employees. A phantom unit settles in cash equal to the price of one share of our common stock on the vesting date. Phantom units vest ratably over 3 years on each anniversary date of the original grant. We recognize compensation expense for phantom units on a straight-line basis for each tranche of each award based on the closing price of our common stock at each balance sheet date. The outstanding phantom units had a fair value of $10.39 per unit at September 30, 2020 and our accrued liability for such units was $2.2 million. Phantom Plan activity is summarized below.
| Phantom Plan units |  | Weighted average grant date fair value per unit |  | Weighted average remaining contractual term (years) |  | Aggregate intrinsic value (millions)
Outstanding at September 30, 2017 | 352,007 |  |  | $ | 11.36 |  |  | 0.9 |  |
Granted | 163,199 |  |  | 12.40 |  |  |  |  |
Vested | (170,675) |  |  |  |  |  |  | $ | 2.1 |
Cancelled | (81,758) |  |  | 12.10 |  |  |  |  |
Outstanding at September 30, 2018 | 262,773 |  |  | 12.12 |  |  | 0.6 |  |
Granted | 180,747 |  |  | 10.53 |  |  |  |  |
Vested | (132,289) |  |  |  |  |  |  | 1.4 |
Cancelled | (55,077) |  |  | 11.61 |  |  |  |  |
Outstanding at September 30, 2019 | 256,154 |  |  | 11.39 |  |  | 0.9 |  |
Granted | 188,973 |  |  | 11.26 |  |  |  |  |
Vested | (118,908) |  |  |  |  |  |  | 1.3 |
Cancelled | (11,744) |  |  | 11.23 |  |  |  |  |
Outstanding at September 30, 2020 | 314,475 |  |  | 11.16 |  |  | 0.9 |  |

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