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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes
Effective tax rate (as a percent)	27.40%	62.90%
Federal statutory rate (as a percent)	35.00%
Favorable tax impact driven by changes in geographical mix	$ 4.1
Gross Book Tax Differences of Foreign Subsidiaries	1,600.0
Undistributed earnings related to foreign subsidiaries	$ 113.2

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- Definition

Amount of gross book tax differences of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Tax benefit related to tax impacts of changes in geographical mixes of income.

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- Definition

Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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