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Stock-based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Effect on Statement of Operations |
| 2014 |  | 2013 |  | 2012
| (in millions, except per share data)
Decrease in operating income | $ | 13.2 |  |  | $ | 11.4 |  |  | $ | 6.0 |
Decrease in net income or increase in net loss | 8.1 |  |  | 6.9 |  |  | 3.5 |
Effect on earnings or loss per basic share | 0.05 |  |  | 0.04 |  |  | 0.02 |
Effect on earnings or loss per diluted share | 0.05 |  |  | 0.04 |  |  | 0.02 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | Restricted Stock Units. Depending on the specific terms of each award, restricted stock units generally vest on the three-year anniversary of the grant date, or ratably over the life of the award, usually three years, on each anniversary date of the original grant. Restricted stock units granted since November 2007 also vest upon the Retirement (as defined in the 2006 Plan) of a participant. 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, 2011 | 2,065,766 |  |  | $ | 6.11 |  |  | 1.6 |  |
Granted | 1,406,318 |  |  | 2.19 |  |  |  |  |
Vested | (867,451 | ) |  | 5.44 |  |  |  |  | $ | 2.2 |
Cancelled | (180,871 | ) |  | 5.33 |  |  |  |  |
Outstanding at September 30, 2012 | 2,423,762 |  |  | 4.13 |  |  | 1.0 |  |
Granted | 509,338 |  |  | 5.37 |  |  |  |  |
Vested | (995,037 | ) |  | 4.77 |  |  |  |  | 5.6 |
Cancelled | (12,723 | ) |  | 12.28 |  |  |  |  |
Outstanding at September 30, 2013 | 1,925,340 |  |  | 4.30 |  |  | 0.9 |  |
Granted | 381,012 |  |  | 8.51 |  |  |  |  |
Vested | (1,099,591 | ) |  | 4.94 |  |  |  |  | 9.4 |
Cancelled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2014 | 1,206,761 |  |  | $ | 5.04 |  |  | 0.7 |  |
Schedule of Share-based Compensation. Options | Stock Options. Outstanding stock options generally vest on each anniversary date of the original grant ratably over three years. 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. 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, 2011 | 5,625,133 |  |  | $ | 6.74 |  |  | 7.5 |  | $ | — |
Granted | 677,117 |  |  | 2.18 |  |  |  |  |
Exercised | (8,552 | ) |  | 3.59 |  |  |  |  | — |
Cancelled | (771,088 | ) |  | 5.97 |  |  |  |  |
Outstanding at September 30, 2012 | 5,522,610 |  |  | 6.30 |  |  | 6.8 |  | 3.5 |
Granted | 125,780 |  |  | 5.91 |  |  |  |  |
Exercised | (384,475 | ) |  | 4.97 |  |  |  |  | 1.2 |
Cancelled | (139,209 | ) |  | 12.52 |  |  |  |  |
Outstanding at September 30, 2013 | 5,124,706 |  |  | 6.22 |  |  | 5.9 |  | 14.6 |
Granted | 86,904 |  |  | 8.58 |  |  |  |  |
Exercised | (587,964 | ) |  | 4.61 |  |  |  |  | — |
Cancelled | (71,411 | ) |  | 12.92 |  |  |  |  |
Outstanding at September 30, 2014 | 4,552,235 |  |  | $ | 6.37 |  |  | 5.0 |  | $ | 13.6 |
Exercisable at September 30, 2014 | 4,151,589 |  |  | $ | 6.56 |  |  | 4.8 |  | $ | 12.0 |
Expected to vest after September 30, 2014 | 400,136 |  |  | $ | 4.32 |  |  | 7.9 |  | $ | 1.6 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | 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, 2014 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 |  |  |  | 1,803,311 |  |  | $ | 3.23 |  |  | 6.4 |  | 1,565,034 |  |  | $ | 3.37 |
| $ | 5.00 |  | - | $ | 9.99 |  |  |  | 1,801,805 |  |  | 5.85 |  |  | 5.0 |  | 1,639,436 |  |  | 5.70 |
| $ | 10.00 |  | - | $ | 14.99 |  |  |  | 656,276 |  |  | 11.84 |  |  | 2.7 |  | 656,276 |  |  | 11.84 |
| $ | 15.00 |  | - | $ | 20.99 |  |  |  | 290,843 |  |  | 16.71 |  |  | 1.8 |  | 290,843 |  |  | 16.71 |
|  |  |  |  |  | 4,552,235 |  |  | $ | 6.37 |  |  | 5.0 |  | 4,151,589 |  |  | $ | 6.56 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | Compensation expense attributed to stock options is based on the fair value of the awards on their respective grant dates, as determined using a Black-Scholes model. The weighted average grant-date fair values of stock options granted and the weighted average assumptions used to determine these fair values are indicated below.
| 2014 |  | 2013 |  | 2012
Grant-date fair value | $ | 5.13 |  |  | $ | 5.91 |  |  | $ | 1.31 |
Risk-free interest rate | 2.44 | % |  | 1.63 | % |  | 1.74 | %
Dividend yield | 1.10 | % |  | 2.17 | % |  | 1.97 | %
Expected life (years) | 8.0 |  |  | 8.0 |  |  | 8.0 |
Expected annual volatility | 0.6386 |  |  | 0.6696 |  |  | 0.7342 |
The risk-free interest rate is based on the U.S. Treasury zero-coupon yield in effect at the grant date with a term equal to the expected life. The expected dividend yield is based on our estimated annual dividend and stock price history at the grant date. The expected term represents the period of time the awards are expected to be outstanding.
Schedule of Share-based Compensation, Phantom Award, Activity | Phantom Plan. In 2012, the Company adopted the Mueller Water Products, Inc. Phantom Plan (“Phantom Plan”). The Phantom Plan awards were awarded to certain non-officer employees. Outstanding phantom awards vest ratably on each anniversary date of the original grant for three years. Compensation expense for Phantom Plan awards is charged against income 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. Phantom Plan awards are payable in cash and recorded as liability awards. The outstanding Phantom Plan awards had a fair value of $8.28 per award at September 30, 2014 and our liability for such awards was $3.4 million. Phantom Plan activity for 2014 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, 2011 | — |  |  |  |  |  |  |
Granted | 358,866 |  |  | $ | 2.03 |  |  |  |  |
Vested | — |  |  |  |  |  |  | $ | — |
Cancelled | — |  |  | — |  |  |  |  |
Outstanding at September 30, 2012 | 358,866 |  |  | 2.03 |  |  | 1.2 |  |
Granted | 382,605 |  |  | 5.22 |  |  |  |  |
Vested | (119,637 | ) |  |  |  |  |  | 0.7 |
Cancelled | (12,852 | ) |  | 2.03 |  |  |  |  |
Outstanding at September 30, 2013 | 608,982 |  |  | 4.03 |  |  | 1.0 |  |
Granted | 304,815 |  |  | 8.52 |  |  |  |  |
Vested | (240,739 | ) |  |  |  |  |  | 2.1 |
Cancelled | (29,770 | ) |  | 5.29 |  |  |  |  |
Outstanding at September 30, 2014 | 643,288 |  |  | $ | 6.22 |  |  | 0.8 |  |

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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: 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 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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