CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 31.1	$ 40.0
Accounts receivable, net	208.9	202.7
Inventories	148.4	153.8
Prepaid expenses	19.0	17.0
Deferred income taxes	7.3	7.0
Income taxes receivable	11.1	7.0
Other	4.1	2.0
Total current assets	429.9	429.5
Property, plant, equipment, and mineral rights and reserves:
Land	12.1	13.0
Mineral rights	44.7	48.6
Depreciable assets	563.6	552.0
Gross property, plant and equipment	620.4	613.6
Accumulated depreciation and depletion	(315.1)	(311.7)
Net property, plant and equipment	305.3	301.9
Goodwill	69.6	70.2
Intangible assets, net	32.9	33.9
Investment in and advances to affiliates and joint ventures	33.6	27.8
Available-for-sale securities	8.7	14.6
Deferred income taxes	8.0	7.4
Other assets	27.0	25.3
Total noncurrent assets	485.1	481.1
Total Assets	915.0	910.6
Current liabilities:
Accounts payable	55.0	51.1
Accrued income taxes	6.5	5.0
Accrued liabilities	59.0	58.4
Total current liabilities	120.5	114.5
Noncurrent liabilities:
Long-term debt	251.6	248.8
Pension liabilities	37.7	37.5
Deferred compensation	10.3	9.4
Deferred income taxes	13.0	12.8
Other long-term liabilities	21.3	22.5
Total noncurrent liabilities	333.9	331.0
Shareholders' Equity:
Common stock	0.3	0.3
Additional paid in capital	111.2	105.1
Retained earnings	359.2	355.2
Accumulated other comprehensive income (loss)	(12.8)	0.8
Treasury stock	(0.7)	0
Total AMCOL shareholders' equity	457.2	461.4
Noncontrolling interest	3.4	3.7
Total equity	460.6	465.1
Total Liabilities and Shareholders' Equity	$ 915.0	$ 910.6