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Stock-based Compensation Plans | 6 Months Ended
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Mar. 31, 2016
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 8. Stock-based Compensation Plans We have granted various forms of stock-based compensation, including stock options, restricted stock units and both cash-settled and stock-settled performance-based restricted stock units (“PRSUs”) under our Amended and Restated 2006 Mueller Water Products, Inc. Stock Incentive Plan (the “2006 Stock Plan”). We have also granted cash-settled Phantom Plan instruments under the Mueller Water Products, Inc. Phantom Plan (“Phantom 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 determine the financial performance targets related to PRSUs for a given performance period, typically during the first quarter of that fiscal year, that portion of a PRSU award becomes granted. Thus, each award consists of a grant in the year of award and grants in the designated following years. Settlement will range from zero to two times the number of PRSUs granted, depending on our financial performance against the targets. As determined at the date of award, PRSUs may settle in cash-value equivalent of, or directly in, shares of our common stock. The stock-settled PRSUs awarded in 2014 settled in the quarter ended December 31, 2016 with an issuance of 263,410 shares of our common stock. This settlement reflected payouts of 1.021 times target for the 2016 performance period, zero times target for the 2015 performance period and two times target for the 2014 performance period. The 234,895 stock-settled PRSUs awarded in the six months ended March 31, 2017 will settle in three years. During the quarter and six months ended March 31, 2017, 91,547 and 346,961 restricted stock units vested, respectively. At March 31, 2017, the outstanding Phantom Plan instruments had a fair value of $11.82 per instrument and our liability for Phantom Plan instruments was $1.9 million. We granted stock-based compensation under the 2006 Stock Plan, the Mueller Water Products, Inc. 2006 Employee Stock Purchase Plan and the Phantom Plan during the six months ended March 31, 2017 as follows.
|  | Number granted |  | Weighted average grant date fair value per instrument |  | Total grant date fair value (in millions)
Quarter ended December 31, 2016: |  |  |  |  |  |
Restricted stock units |  | 177,861 |  |  | $ | 13.26 |  |  | $ | 2.4 |
Employee stock purchase plan instruments |  | 39,231 |  |  | 2.34 |  |  | 0.1 |
Phantom Plan awards |  | 187,115 |  |  | 13.26 |  |  | 2.5 |
PRSUs: 2017 award |  | 59,285 |  |  | 13.26 |  |  | 0.8 |
2016 award |  | 73,826 |  |  | 13.26 |  |  | 1.0 |
2015 award |  | 68,556 |  |  | 13.26 |  |  | 0.9 |
Quarter ended March 31, 2017: |  |  |  |  |  |
Restricted stock units |  | 165,999 |  |  | 12.82 |  |  | 2.1 |
Employee stock purchase plan instruments |  | 38,267 |  |  | 2.44 |  |  | 0.1 |
Phantom Plan awards |  | 12,145 |  |  | 12.66 |  |  | 0.2 |
PRSUs: 2017 award |  | 19,012 |  |  | 13.15 |  |  | 0.2 |
|  |  |  |  |  | $ | 10.3 |
Income from continuing operations included stock-based compensation expense of $2.0 million and $1.8 million during the quarters ended March 31, 2017 and 2016, respectively, and $4.7 million and $3.6 million during the six months ended March 31, 2017 and 2016, respectively. At March 31, 2017, there was approximately $13.6 million of unrecognized compensation expense related to stock-based compensation arrangements, and 219,866 PRSUs that have been awarded for the 2018 and 2019 performance periods, for which performance goals have not been set. We excluded 367,841 and 1,038,029 of stock-based compensation instruments from the calculations of diluted earnings per share for the quarters ended March 31, 2017 and 2016, respectively, and 350,286 and 1,016,155 for the six months ended March 31, 2017 and 2016, respectively, since their inclusion would have been antidilutive.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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