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Income Taxes (Tables) | 6 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of Discrete Deferred Tax Adjustments | Discrete deferred income tax adjustments recorded during each of the three month periods ended December 31, 2017 and March 31, 2018, and the six months ended March 31, 2018, which reduced (increased) income tax expense consisted primarily of the following items:
|  | Provisional amounts - Three months ended December 31, 2017 |  | Changes to provisional amounts - Three months ended March 31, 2018 |  | Provisional amounts - Six months ended March 31, 2018
Reduction in net deferred tax liabilities in the U.S. from the reduction of the U.S. tax rate |  | $ | 180.3 |  |  | $ | — |  |  | $ | 180.3 |
Establishment of valuation allowances related to deferred tax assets impacted by TCJA |  | (12.6 | ) |  | 5.0 |  |  | (7.6 | )
Toll-tax on un-repatriated earnings |  | (1.7 | ) |  | 0.3 |  |  | (1.4 | )
Total discrete deferred income tax adjustments |  | $ | 166.0 |  |  | $ | 5.3 |  |  | $ | 171.3 |
Impact on earnings per share: |  |  |  |  |  |
Basic earnings per share |  | $ | 0.96 |  |  | $ | 0.03 |  |  | $ | 0.99 |
Diluted earnings per share |  | $ | 0.94 |  |  | $ | 0.03 |  |  | $ | 0.97 |

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