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Income Taxes (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017 USD ($) subsidiary	Jun. 30, 2016	Jun. 30, 2017 USD ($) subsidiary	Jun. 30, 2016	Sep. 30, 2016 USD ($)
Income Taxes
Effective tax rate (as a percent)	8.20%	(71.20%)	0.50%	(18.60%)
Federal statutory rate (as a percent)	35.00%		35.00%
Benefit due to reinvesting portion of undistributed earnings	$ 21.2		$ 21.2
Tax benefit related to non-controlling interests	12.1		20.1
Favorable tax impact driven by changes in geographical mix	7.1		14.5
Income tax credits and incentives	6.8		14.2
Income tax expense nondeductible expenses	6.9		13.1
Gross Book Tax Differences of Foreign Subsidiaries	1,800.0		1,800.0
Undistributed earnings related to foreign subsidiaries	$ 92.0		92.0		$ 113.2
United Kingdom
Income Taxes
Valuation allowances			$ 57.2
European
Income Taxes
Number of subsidiaries recapitalized | subsidiary	1		1

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