Discontinued Operations Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended
	Jan. 03, 2010	Jun. 30, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Jan. 01, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Ownership Percentage					55.00%
Asset Impairment Charges			$ 0	$ 0	$ 1.1
Agora-X, LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Ownership Percentage							80.00%
Controlling Interest Sold	65.00%
Proceeds from Noncontrolling Interests			6.6
Noncontrolling Interest, Ownership Percentage by Parent						15.00%
Asset Impairment Charges		0.5
Gain (Loss) on Sale of Business				0.2	1.9
Gain (Loss) On Sale Of Business, Net of Tax					1.3
INTL Capital Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Business					$ (0.7)