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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2020
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The components of income before income taxes from continuing operations are presented below.
| 2020 |  | 2019 |  | 2018
| (in millions)
U.S. | $ | 89.7 |  |  | $ | 78.4 |  |  | $ | 97.3 |
Non-U.S. | 4.4 |  |  | 3.7 |  |  | (1.6) |
Income before income taxes | $ | 94.1 |  |  | $ | 82.1 |  |  | $ | 95.7 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of income tax (benefit) expense are presented below.
| 2020 |  | 2019 |  | 2018
| (in millions)
Current: |  |  |  |  |
U.S. federal | $ | 10.9 |  |  | $ | 11.6 |  |  | $ | 25.7 |
U.S. state and local | 2.7 |  |  | 3.9 |  |  | 7.1 |
Non-U.S. | 1.3 |  |  | 1.5 |  |  | 0.6 |
| 14.9 |  |  | 17.0 |  |  | 33.4 |
Deferred: |  |  |  |  |
U.S. federal | 5.6 |  |  | 2.5 |  |  | (42.6) |
U.S. state and local | 2.0 |  |  | (0.4) |  |  | (1.0) |
Non-U.S. | (0.4) |  |  | (0.8) |  |  | 0.3 |
| 7.2 |  |  | 1.3 |  |  | (43.3) |
Income tax (benefit) expense | $ | 22.1 |  |  | $ | 18.3 |  |  | $ | (9.9) |
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 is presented below.
| 2020 |  | 2019 |  | 2018
| (in millions)
Expense at U.S. federal statutory income tax rates of 21%, 24.5% and 35%, respectively | $ | 19.8 |  |  | $ | 17.2 |  |  | $ | 23.4 |
Adjustments to reconcile to income tax expense: |  |  |  |  |
State income taxes, net of federal benefit | 3.3 |  |  | 3.2 |  |  | 4.8 |
Uncertain tax positions | 1.0 |  |  | (1.4) |  |  | — |
Nondeductible compensation | 0.6 |  |  | 0.3 |  |  | 0.2 |
Nondeductible expenses, other than compensation | 0.4 |  |  | 1.3 |  |  | 0.5 |
Valuation allowances | 0.1 |  |  | 1.3 |  |  | 0.5 |
Basis difference in foreign investment | 0.1 |  |  | (1.1) |  |  | — |
Foreign income taxes | — |  |  | 0.1 |  |  | — |
Domestic production activities deduction | — |  |  | — |  |  | (2.4) |
Federal tax rate change | — |  |  | — |  |  | (42.5) |
Federal transition tax | — |  |  | (0.6) |  |  | 7.5 |
Excess tax benefits related to stock compensation | (0.5) |  |  | (0.3) |  |  | (0.6) |
Tax credits | (1.8) |  |  | (1.8) |  |  | (1.7) |
Other | (0.9) |  |  | 0.1 |  |  | 0.4 |
Income tax expense (benefit) | $ | 22.1 |  |  | $ | 18.3 |  |  | $ | (9.9) |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax balances are presented below.
| September 30,
| 2020 |  | 2019
| (in millions)
Deferred income tax assets: |  |  |
Accrued expenses | $ | 12.2 |  |  | $ | 10.0 |
Lease liabilities | 7.3 |  |  | — |
Inventory | 4.6 |  |  | 11.7 |
State net operating losses | 3.0 |  |  | 2.8 |
Federal credit carryovers | 3.0 |  |  | 2.8 |
Stock-based compensation | 2.6 |  |  | 2.7 |
Pension | 0.2 |  |  | 1.7 |
Other | 1.1 |  |  | 2.4 |
| 34.0 |  |  | 34.1 |
Valuation allowance | (2.9) |  |  | (2.8) |
Total deferred income tax assets, net of valuation allowance | 31.1 |  |  | 31.3 |
Deferred income tax liabilities: |  |  |
Intangible assets | 90.2 |  |  | 95.6 |
Lease assets | 6.6 |  |  | — |
Basis difference in foreign investment | 5.0 |  |  | 4.7 |
Other | 25.6 |  |  | 18.9 |
Total deferred income tax liabilities | 127.4 |  |  | 119.2 |
Net deferred income tax liabilities | $ | 96.3 |  |  | $ | 87.9 |
Schedule of Unrecognized Tax Benefits Roll Forward | The following table summarizes information concerning our gross unrecognized tax benefits.
| 2020 |  | 2019
| (in millions)
Balance at beginning of year | $ | 3.3 |  |  | $ | 3.3 |
Increases related to current year positions | 1.5 |  |  | 0.4 |
Increases related to prior year positions | — |  |  | 2.0 |
Decreases due to lapse in statute of limitations | (0.3) |  |  | (2.4) |
Balance at end of year | $ | 4.5 |  |  | $ | 3.3 |

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