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Stock-based Compensation Plans | 6 Months Ended
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Mar. 31, 2015
Share-based Compensation [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] |
ote 5. | 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”). 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 grant, 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 cash-settled PRSUs granted in the quarter ended December 31, 2012 settled in the quarter ended December 31, 2014 for $4.0 million. The stock-settled PRSUs granted in the quarters ended December 31, 2012, 2013 and 2014 will settle in the quarters ending December 31, 2015, 2016, and 2017, respectively. The stock prices used to value the awards were $5.22 for the 2013 performance period, $8.52 for the 2014 performance period and $9.78 for the 2015 performance period. We have granted Phantom Plan awards under the Mueller Water Products, Inc. Phantom Plan (“Phantom Plan”). At March 31, 2015, the outstanding Phantom Plan awards had a fair value of $9.85 per award and our liability for Phantom Plan awards was $2.3 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 six months ended March 31, 2015 as follows.
| Number granted |  | Weighted average grant date fair value per instrument |  | Total grant date fair value (in millions)
Quarter ended December 31, 2014: |  |  |  |  |
Restricted stock units | 378,036 |  |  | $ | 9.78 |  |  | $ | 3.7 |
Employee stock purchase plan instruments | 51,574 |  |  | 1.89 |  |  | 0.1 |
Phantom Plan awards | 289,524 |  |  | 9.78 |  |  | 2.8 |
PRSUs | 240,691 |  |  | 9.78 |  |  | 2.4 |
Quarter ended March 31, 2015: |  |  |  |  |
Restricted stock units | 40,617 |  |  | 9.97 |  |  | 0.4 |
Non-qualified stock options | 97,119 |  |  | 5.93 |  |  | 0.6 |
Employee stock purchase plan instruments | 56,964 |  |  | 1.96 |  |  | 0.1 |
|  |  |  |  | $ | 10.1 |
We recorded stock-based compensation expense of $1.9 million and $2.0 million during the three months ended March 31, 2015 and 2014, respectively, and $5.3 million and $6.1 million during the six months ended March 31, 2015 and 2014, respectively. At March 31, 2015, there was approximately $7.9 million of unrecognized compensation expense related to stock-based awards. We excluded 998,980 and 1,087,649 of stock-based compensation instruments from the calculations of diluted earnings per share for the quarters ended March 31, 2015 and 2014, respectively, and 2,812,066 and 1,159,708 for six months ended March 31, 2015 and 2014, 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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: 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 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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