Noncontrolling Interest (Tables) (AMCOL Shareholders [Member])

3 Months Ended

Mar. 31, 2012

AMCOL Shareholders [Member]

Change from net income and transfers from noncontrolling interest

	Three Months Ended March  31,
	2012		2011
Net income attributable to AMCOL shareholders	$	12.8	$	12.2
Transfers from noncontrolling interest:
Decrease in additional paid-in capital for purchase of the remaining noncontrolling interest in Volclay South Africa (Proprietary) Limited		-		(5.2	)
Decrease in additional paid-in capital for transfer of 26% interest in Batlhako		-		(3.4	)
Change from net income attributable to AMCOL shareholders and transfers from noncontrolling interest	$	12.8	$	3.6