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Income Tax Reform (Tables) | 9 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Summary of Discrete Deferred Tax Adjustments | Discrete deferred income tax adjustments recorded during the three and nine months ended June 30, 2018, which reduced (increased) income tax expense consisted primarily of the following items:
|  | Provisional amounts - Six months ended March 31, 2018 |  | Changes to provisional amounts - Three months ended June 30, 2018 |  | Provisional amounts - Nine months ended June 30, 2018
Reduction in net deferred tax liabilities in the U.S. from the reduction of the U.S. tax rate |  | $ | 180.3 |  |  | $ | 0.8 |  |  | $ | 181.1 |
Establishment of valuation allowances related to deferred tax assets impacted by TCJA |  | (7.6 | ) |  | — |  |  | (7.6 | )
Toll-tax on un-repatriated earnings |  | (1.4 | ) |  | — |  |  | (1.4 | )
Total discrete deferred income tax adjustments |  | $ | 171.3 |  |  | $ | 0.8 |  |  | $ | 172.1 |
Impact on earnings per share: |  |  |  |  |  |
Basic earnings per share |  | $ | 0.99 |  |  | $ | — |  |  | $ | 0.99 |
Diluted earnings per share |  | $ | 0.97 |  |  | $ | — |  |  | $ | 0.97 |

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