CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 35.1	$ 40.0
Accounts receivable, net	230.1	202.7
Inventories	147.6	153.8
Prepaid expenses	22.0	17.0
Deferred income taxes	5.4	7.0
Income taxes receivable	15.7	7.0
Other	3.2	2.0
Total current assets	459.1	429.5
Property, plant, equipment, and mineral rights and reserves:
Land	11.1	13.0
Mineral rights	42.5	48.6
Depreciable assets	572.9	552.0
Gross property, plant and equipment	626.5	613.6
Accumulated depreciation and depletion	(318.9)	(311.7)
Net property, plant and equipment	307.6	301.9
Goodwill	69.5	70.2
Intangible assets, net	32.2	33.9
Investment in and advances to affiliates and joint ventures	34.3	27.8
Available-for-sale securities	10.7	14.6
Deferred income taxes	7.6	7.4
Other assets	27.1	25.3
Total noncurrent assets	489.0	481.1
Total Assets	948.1	910.6
Current liabilities:
Accounts payable	61.3	51.1
Accrued income taxes	9.0	5.0
Accrued liabilities	62.6	58.4
Total current liabilities	132.9	114.5
Noncurrent liabilities:
Long-term debt	270.2	248.8
Pension liabilities	37.9	37.5
Deferred compensation	10.9	9.4
Deferred income taxes	11.9	12.8
Other long-term liabilities	19.3	22.5
Total noncurrent liabilities	350.2	331.0
Shareholders' Equity:
Common stock	0.3	0.3
Additional paid in capital	112.7	105.1
Retained earnings	369.3	355.2
Accumulated other comprehensive income (loss)	(20.5)	0.8
Total AMCOL shareholders' equity	461.8	461.4
Noncontrolling interest	3.2	3.7
Total equity	465.0	465.1
Total Liabilities and Shareholders' Equity	$ 948.1	$ 910.6