Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Sep. 30, 2013
Income Taxes
Effective tax rate (as a percent)	29.00%		36.00%
Unrecognized tax benefits, exclusive of interest and penalties	$ 4.7	$ 4.7	$ 4.8
Unrecognized tax benefits from permanent tax adjustments that, if recognized, would affect the effective rate	4.7	4.7
Estimated unrecognized tax benefits resulting from possible resolution of reviews by domestic and international taxing authorities	0.1	0.1
Period of cumulative income or loss under assessment to determine if a valuation allowance is required		3 years
Valuation allowance on net deferred tax assets for Australia	$ 4.0	$ 4.0