Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Accumulated other comprehensive income (loss) [Line Items]
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	$ 0.3	$ (0.1)	$ 1.0	$ (0.5)
Foreign currency exchange (loss) gain, net	(0.6)	0.2	(1.4)	0.1
Other, net	(0.3)	(1.0)	(1.5)	(1.2)
Other (expense) income, net	$ (0.6)	$ (0.9)	$ (1.9)	$ (1.6)