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Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	Aug. 03, 2012	Jun. 30, 2012 Current Assets [Member]	Dec. 31, 2011 Current Assets [Member]	Dec. 31, 2011 Current Assets [Member] Mutual Funds [Member]	Dec. 31, 2011 Current Assets [Member] Other [Member]	Jun. 30, 2012 Noncurrent Assets [Member]	Dec. 31, 2011 Noncurrent Assets [Member]	Jun. 30, 2012 Noncurrent Assets [Member] Other [Member]	Dec. 31, 2011 Noncurrent Assets [Member] Other [Member]	Jun. 30, 2012 Noncurrent Assets [Member] Amalgamated Sugar Company LLC [Member]	Dec. 31, 2011 Noncurrent Assets [Member] Amalgamated Sugar Company LLC [Member]	Jun. 30, 2012 Noncurrent Assets [Member] TIMET Common Stock [Member]	Dec. 31, 2011 Noncurrent Assets [Member] TIMET Common Stock [Member]
Schedule of Marketable Securities
Market value		$ 0.8	$ 22.5	$ 20.9	$ 1.6	$ 329.9	$ 354.1	$ 6.2	$ 6.4	$ 250.0	$ 250.0	$ 73.7	$ 97.7
Cost basis		0.8	22.7	21.1	1.6	342.1	342.5	6.1	6.5	250.0	250.0	86.0	86.0
Unrealized gains/(losses), net	$ 6.9		$ (0.2)	$ (0.2)		$ (12.2)	$ 11.6	$ 0.1	$ (0.1)			$ (12.3)	$ 11.7

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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