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Stock-based Compensation Plans | 9 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Share-based Payment Arrangement [Text Block] | Stock-based Compensation Plans We have granted various forms of stock-based compensation, including stock options, restricted stock units and performance-based restricted stock units (“PRSUs”) under our Amended and Restated 2006 Mueller Water Products, Inc. Stock Incentive Plan (the “2006 Stock Plan”). A PRSU award represents a target number of units that may be paid out at the end of a multi-year award cycle consisting of a series of annual performance periods coinciding with our fiscal years. After we establish the financial performance targets related to PRSUs for a given performance period, typically during the first quarter of that fiscal year, we consider that portion of a PRSU award to be granted. Thus, each award consists of a grant in the year of award and grants in the designated following years. Settlements, in our common shares, will range from zero to two times the number of PRSUs granted, depending on our financial performance against the targets. We awarded 332,875 stock-settled PRSUs in the nine months ended June 30, 2019 that are scheduled to settle in 3 years. We issued 181,065 shares and 146,061 shares of common stock during the nine months ended June 30, 2019 and 2018, respectively, to settle PRSUs. In addition to the PRSU activity, zero and 259,107 restricted stock units vested during the three and nine months ended June 30, 2019, respectively. We have granted cash-settled Phantom Plan instruments under the Mueller Water Products, Inc. Phantom Plan (“Phantom Plan”). At June 30, 2019, the outstanding Phantom Plan instruments had a fair value of $9.82 per instrument and our liability for Phantom Plan instruments was $1.3 million. We granted stock-based compensation awards under the 2006 Stock Plan, the Mueller Water Products, Inc. 2006 Employee Stock Purchase Plan and the Phantom Plan during the nine months ended June 30, 2019 as follows.
|  | Number granted |  | Weighted average grant date fair value per instrument |  | Total grant date fair value (in millions)
Quarter ended December 31, 2018: |  |  |  |  |  |
Restricted stock units |  | 147,409 |  |  | $ | 10.53 |  |  | $ | 1.6 |
Employee stock purchase plan instruments |  | 45,464 |  |  | 2.30 |  |  | 0.1 |
Phantom Plan awards |  | 168,380 |  |  | 10.53 |  |  | 1.8 |
PRSUs: 2019 award |  | 110,595 |  |  | 10.53 |  |  | 1.2 |
2018 award |  | 49,236 |  |  | 10.53 |  |  | 0.5 |
2017 award |  | 31,229 |  |  | 10.53 |  |  | 0.3 |
Quarter ended March 31, 2019: |  |  |  |  |  |
Restricted stock units |  | 76,919 |  |  | 9.35 |  |  | 0.7 |
Employee stock purchase plan instruments |  | 43,139 |  |  | 2.50 |  |  | 0.1 |
Quarter ended June 30, 2019: |  |  |  |  |  |
Restricted stock units |  | 4,854 |  |  | 9.27 |  |  | — |
Employee stock purchase plan instruments |  | 42,890 |  |  | 1.88 |  |  | 0.1 |
|  |  |  |  |  | $ | 6.4 |
Operating income included stock-based compensation expense of $1.4 million and $1.2 million during the three months ended June 30, 2019 and 2018, respectively, and $4.2 million and $5.3 million during the nine months ended June 30, 2019 and 2018, respectively. At June 30, 2019, there was approximately $7.7 million of unrecognized compensation expense related to stock-based compensation arrangements and there were 264,936 PRSUs that have been awarded for the 2020 and 2021 performance periods for which performance goals have not been set. We excluded 202,245 and 213,599 of stock-based compensation instruments from the calculations of diluted earnings per share for the quarters ended June 30, 2019 and 2018, respectively, and 167,775 and 245,033 for the nine months ended June 30, 2019 and 2018, respectively, since their inclusion would have been antidilutive.

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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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