Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 40.0	$ 24.1
Accounts receivable, net	202.7	204.4
Inventories	153.8	144.3
Prepaid expenses	17.0	15.2
Deferred income taxes	7.0	4.1
Income taxes receivable	7.0	8.2
Other	2.0	6.2
Total current assets	429.5	406.5
Property, plant, equipment, and mineral rights and reserves:
Land	13.0	12.1
Mineral rights	48.6	52.5
Depreciable assets	552.0	484.7
Gross property, plant and equipment	613.6	549.3
Less: accumulated depreciation and depletion	311.7	275.8
Net property, plant and equipment	301.9	273.5
Goodwill	70.2	69.5
Intangible assets	33.9	36.9
Investment in and advances to affiliates and joint ventures	27.8	26.4
Available-for-sale securities	14.6	3.8
Deferred income taxes	7.4	8.1
Other assets	25.3	24.4
Total noncurrent assets	481.1	442.6
Total Assets	910.6	849.1
Current liabilities:
Accounts payable	51.1	56.5
Accrued income taxes	5.0	2.3
Accrued liabilities	58.4	59.2
Total current liabilities	114.5	118.0
Noncurrent liabilities:
Long-term debt	248.8	260.7
Pension liabilities	37.5	34.8
Deferred income taxes	12.8	12.7
Deferred compensation	9.4	8.9
Other long-term liabilities	22.5	19.1
Total noncurrent liabilities	331.0	336.2
Equity:
Common stock, par value $.01 per share, 100,000,000 shares authorized; 32,184,110 and 32,015,771 shares issued in 2012 and 2011, respectively	0.3	0.3
Additional paid in capital	105.1	94.3
Retained earnings	355.2	314.3
Accumulated other comprehensive income (loss)	0.8	(14.7)
Stockholders' equity before treasury stock	461.4	394.2
Less: Treasury stock (0 and 286,802 shares in 2012 and 2011, respectively)	0	3.4
Total AMCOL shareholders' equity	461.4	390.8
Noncontrolling interest	3.7	4.1
Total equity	465.1	394.9
Total liabilities and equity	$ 910.6	$ 849.1