Noncontrolling Interest (Tables)

12 Months Ended

Dec. 31, 2012

Noncontrolling Interest [Abstract]

Net income and transfers from noncontrolling interest

The following table sets forth the effects of these transactions on equity attributable to AMCOL's shareholders.

	Twelve Months Ended December 31,
	2012		2011
Net income attributable to AMCOL shareholders	$	65.1	$	58.5
Transfers from noncontrolling interest:
Decrease in additional paid-in capital for purchase of the remaining noncontrolling interest in South Africa (Proprietary) Limited		-		(5.4	)
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	$	65.1	$	49.7