Other Operating-Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		1 Months Ended	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Feb. 28, 2011 GROWMARK, Inc. Warehouse	Mar. 31, 2012 Loss (gain) on disposal of property, plant and equipment and non-core assets - net	Mar. 31, 2011 Loss (gain) on disposal of property, plant and equipment and non-core assets - net	Mar. 31, 2012 Engineering studies	Mar. 31, 2012 Bartow costs	Mar. 31, 2011 Bartow costs	Mar. 31, 2012 Other:	Mar. 31, 2011 Other:
Other operating-Net
Other operating - net	$ 22.3	$ (31.0)		$ 4.0	$ (32.7)	$ 6.4	$ 0.8	$ 0.8	$ 11.1	$ 0.9
Number of dry product warehouses sold			4
Pre-tax gain (loss) on sale of assets	$ (3.9)	$ 32.7	$ 32.5