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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense (benefit) for the years ended September 30, 2018, 2017, and 2016 was allocated as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
Income tax expense attributable to income from operations | $ | 46.0 |  |  | $ | 8.8 |  |  | $ | 18.0 |
Taxes allocated to stockholders’ equity, related to pension liabilities | 0.1 |  |  | 1.0 |  |  | 0.2 |
Taxes allocated to additional paid-in capital, related to share-based compensation | — |  |  | 0.1 |  |  | (0.8 | )
Total income tax expense | $ | 46.1 |  |  | $ | 9.9 |  |  | $ | 17.4 |
The components of income tax expense (benefit) attributable to income from operations were as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
Current taxes: |  |  |  |  |
U.S. federal | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 1.3 |
U.S. State and local | 0.5 |  |  | 1.2 |  |  | 0.8 |
International | 22.4 |  |  | 16.7 |  |  | 16.8 |
Total current taxes | 23.7 |  |  | 18.6 |  |  | 18.9 |
Deferred taxes | 22.3 |  |  | (9.8 | ) |  | (0.8 | )
Income tax benefit attributable to interest income | — |  |  | — |  |  | (0.1 | )
Income tax expense | $ | 46.0 |  |  | $ | 8.8 |  |  | $ | 18.0 |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | U.S. and international components of (loss) income from operations, before tax, was as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
U.S. | $ | 9.9 |  |  | $ | (13.9 | ) |  | $ | 4.8 |
International | 91.6 |  |  | 29.1 |  |  | 67.9 |
Income from operations, before tax | $ | 101.5 |  |  | $ | 15.2 |  |  | $ | 72.7 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Items accounting for the difference between income taxes computed at the federal statutory rate and income tax expense were as follows:
| Year Ended September 30,
| 2018 |  | 2017 |  | 2016
Federal statutory rate effect of: | 24.5 | % |  | 35.0 | % |  | 35.0 | %
U.S. State and local income taxes | 0.8 | % |  | (2.6 | )% |  | 1.3 | %
Foreign earnings and losses taxed at lower rates | (0.8 | )% |  | 11.5 | % |  | (11.0 | )%
Change in foreign valuation allowance | (0.8 | )% |  | (1.4 | )% |  | (0.3 | )%
Change in state valuation allowance | — | % |  | 4.1 | % |  | — | %
U.S. permanent items | (0.2 | )% |  | 3.6 | % |  | 0.8 | %
Foreign permanent items | 2.1 | % |  | 8.1 | % |  | 1.9 | %
U.S. bargain purchase gain | — | % |  | — | % |  | (3.0 | )%
Remeasurement of deferred tax | 8.5 | % |  | — | % |  | — | %
Repatriation Transition tax | 11.0 | % |  | — | % |  | — | %
Other reconciling items | 0.2 | % |  | (0.6 | )% |  | 0.3 | %
Effective rate | 45.3 | % |  | 57.7 | % |  | 25.0 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The components of deferred income tax assets and liabilities were as follows:
(in millions) | September 30, 2018 |  | September 30, 2017
Deferred tax assets: |  |  |  |  |
Share-based compensation | $ | 2.8 |  |  | $ | 3.7 |
Pension liability | — |  |  | 0.1 |
Deferred compensation | 1.4 |  |  | 2.0 |
Foreign net operating loss carryforwards | 4.2 |  |  | 5.6 |
U.S. State and local net operating loss carryforwards | 8.7 |  |  | 6.6 |
U.S. federal net operating loss carryforwards | — |  |  | 21.9 |
Intangible assets | 1.8 |  |  | 6.1 |
Bad debt reserve | 1.5 |  |  | 1.4 |
Tax credit carryforwards | — |  |  | 1.6 |
Foreign tax credit carryforwards | 6.5 |  |  | — |
Other compensation | 3.4 |  |  | 3.6 |
Other | 0.9 |  |  | 1.9 |
Total gross deferred tax assets | 31.2 |  |  | 54.5 |
Less valuation allowance | (3.5 | ) |  | (4.0 | )
Deferred tax assets | 27.7 |  |  | 50.5 |
Deferred income tax liabilities: |  |  |
Unrealized gain on securities | 2.6 |  |  | 3.2 |
Prepaid expenses | 1.8 |  |  | 2.5 |
Property and equipment | 3.1 |  |  | 2.2 |
Pension liability | 0.4 |  |  | — |
Deferred income tax liabilities | 7.9 |  |  | 7.9 |
Deferred income taxes, net | $ | 19.8 |  |  | $ | 42.6 |
Summary of Income Tax Contingencies [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| Year Ended September 30,
(in millions) | 2018 |  | 2017 |  | 2016
Balance, beginning of year | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Gross increases for tax positions related to prior years | — |  |  | — |  |  | 0.1 |
Balance, end of year | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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