Earnings per Share Earnings Per Share (Tables)

3 Months Ended

Dec. 31, 2012

Note 2 – Earnings per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

The following is a reconciliation of the numerator and denominator of the diluted net income (loss) per share computations for the periods presented below.

	Three Months Ended December 31,
(in millions, except share amounts)	2012			2011
Numerator:
Income (loss) from operations attributable to INTL FCStone Inc. stockholders	$	13.3		$	(0.4	)
Less: Allocation to participating securities	(0.5		)	—
Income (loss) from operations allocated to common stockholders	$	12.8		$	(0.4	)
Diluted net income (loss)	$	13.3		$	(0.4	)
Less: Allocation to participating securities	(0.5		)	—
Diluted net income (loss) allocated to common stockholders	$	12.8		$	(0.4	)
Denominator:
Weighted average number of:
Common shares outstanding	18,266,338			18,163,489
Dilutive potential common shares outstanding:
Share-based awards	512,337			—
Diluted weighted-average shares	18,778,675			18,163,489