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Income Taxes (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Abstract] |  |
Schedule of Income before Income Tax, Domestic and Foreign | The components of income before income taxes are presented below.
| 2015 |  | 2014 |  | 2013
| (in millions)
U.S. | $ | 55.4 |  |  | $ | 71.6 |  |  | $ | 41.0 |
Non-U.S. | (4.7 | ) |  | 1.9 |  |  | 3.2 |
Income before income taxes | $ | 50.7 |  |  | $ | 73.5 |  |  | $ | 44.2 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense of continuing operations is presented below.
| 2015 |  | 2014 |  | 2013
| (in millions)
Current: |  |  |  |  |
U.S. federal | $ | 12.4 |  |  | $ | 0.1 |  |  | $ | 0.6 |
U.S. state and local | 0.7 |  |  | 1.6 |  |  | 0.1 |
Non-U.S. | (0.2 | ) |  | 0.7 |  |  | 0.8 |
| 12.9 |  |  | 2.4 |  |  | 1.5 |
Deferred: |  |  |  |  |
U.S. federal | 4.5 |  |  | 28.7 |  |  | 6.2 |
U.S. state and local | 2.9 |  |  | (12.8 | ) |  | 1.3 |
Non-U.S. | (0.5 | ) |  | (0.3 | ) |  | (0.2 | )
| 6.9 |  |  | 15.6 |  |  | 7.3 |
Income tax expense | $ | 19.8 |  |  | $ | 18.0 |  |  | $ | 8.8 |
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] | The allocations of current income tax expense between continuing and discontinued operations are provided below.
| 2013
| Continuing operations |  | Discontinued operations
Expense from operations | $ | 17.5 |  |  | $ | 2.1 |
Valuation allowance-related benefit | (8.5 | ) |  | (2.1 | )
Other items | (0.2 | ) |  | — |
Income tax expense | $ | 8.8 |  |  | $ | — |
| The table below represents a summary of the operating results for the U.S. Pipe discontinued operations. These operating results do not reflect what they would have been had U.S. Pipe not been classified as discontinued operations.
| 2013
| (in millions)
Operating income | 0.5 |
Reduced loss on sale of discontinued operations | 4.9 |
Income from discontinued operations, net of tax | $ | 5.4 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliation between income tax expense at the U.S. federal statutory income tax rate and reported income tax expense from continuing operations is presented below.
| 2015 |  | 2014 |  | 2013
| (in millions)
Expense at U.S. federal statutory income tax rate of 35% | $ | 17.7 |  |  | $ | 25.7 |  |  | $ | 15.5 |
Adjustments to reconcile to income tax expense: |  |  |  |  |
State income taxes, net of federal benefit | 2.4 |  |  | 3.6 |  |  | 2.0 |
Domestic production activities deduction | (1.5 | ) |  | — |  |  | — |
Tax credits | (1.3 | ) |  | (0.1 | ) |  | (0.6 | )
Nondeductible expenses, other than compensation | 0.7 |  |  | 0.9 |  |  | 0.5 |
Federal valuation allowance | 0.6 |  |  | (1.2 | ) |  | (7.8 | )
Foreign income taxes | 0.4 |  |  | (0.2 | ) |  | 0.4 |
Nondeductible compensation | 0.3 |  |  | 0.8 |  |  | 0.2 |
State valuation allowance, net of federal benefit | (0.1 | ) |  | (8.4 | ) |  | (1.1 | )
State tax rate change | — |  |  | (2.5 | ) |  | — |
Other | 0.6 |  |  | (0.6 | ) |  | (0.3 | )
Income tax expense | $ | 19.8 |  |  | $ | 18.0 |  |  | $ | 8.8 |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax balances are presented below.
| September 30,
| 2015 |  | 2014
| (in millions)
Deferred income tax assets: |  |  |
Inventory reserves | $ | 15.5 |  |  | $ | 15.2 |
Accrued expenses | 13.6 |  |  | 15.3 |
Pension and other postretirement benefits | 17.8 |  |  | 20.3 |
Stock-based compensation | 8.9 |  |  | 10.7 |
State net operating losses | 8.1 |  |  | 10.3 |
Federal net operating losses and credit carryovers | 0.5 |  |  | 6.8 |
Other | 3.0 |  |  | 1.9 |
| 67.4 |  |  | 80.5 |
Valuation allowance | (1.3 | ) |  | (0.7 | )
Total deferred income tax assets, net of valuation allowance | 66.1 |  |  | 79.8 |
Deferred income tax liabilities: |  |  |
Intangible assets | 182.3 |  |  | 190.1 |
Other | 0.8 |  |  | 1.5 |
Total deferred income tax liabilities | 183.1 |  |  | 191.6 |
Net deferred income tax liabilities | $ | 117.0 |  |  | $ | 111.8 |
Summary of Unrecognized Tax Benefits | The following table summarizes information concerning our gross unrecognized tax benefits.
| 2015 |  | 2014
| (in millions)
Balance at beginning of year | $ | 2.7 |  |  | $ | 3.7 |
Increases related to prior year positions | 0.3 |  |  | 0.1 |
Decreases due to lapse in statute of limitations | (0.4 | ) |  | (1.1 | )
Balance at end of year | $ | 2.6 |  |  | $ | 2.7 |

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