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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Taxes
Effective tax rate (as a percent)	(44.20%)	15.50%	(6.20%)	14.80%
Federal statutory rate (as a percent)	35.00%		35.00%
Tax benefit related to non-controlling interests	$ 5.8		$ 8.0
Valuation allowances income tax credits and incentives	5.3		7.4
Offset of tax credits related to non deductible expenses			6.2
Favorable tax impact driven by changes in geographical mix	1.9		7.4
Gross Book Tax Differences of Foreign Subsidiaries	1,600.0		1,600.0
Undistributed earnings related to foreign subsidiaries	113.2		113.2
United Kingdom
Income Taxes
Valuation allowances	$ 57.2		$ 57.2

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