Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2012 U.S. State net operating losses now recoverable [Member]	Dec. 31, 2013 U.S. State net operating losses now recoverable [Member]	Dec. 31, 2012 U.S. State net operating losses now recoverable [Member]	Dec. 31, 2013 Valuation Allowance, Operating Loss Carryforwards [Member]	Dec. 31, 2012 Valuation Allowance, Operating Loss Carryforwards [Member]	Dec. 31, 2011 Valuation Allowance, Operating Loss Carryforwards [Member]
Income Tax Disclosure [Abstract]
Reserves for discontinued operations, environmental and restructuring	$ 127.7		$ 103.1
Accrued pension and other postretirement benefits	9.4		135.3
Alternative minimum, foreign tax and other credit carryforwards	8.4		11.8
Net operating loss carryforwards	104.0		112.5
Deferred expenditures capitalized for tax	44.9		55.6
Other	124.6		118.5
Deferred tax assets	419.0		536.8
Valuation allowance, net	(108.2)	[1]	(84.5)	[1]
Deferred tax assets, net of valuation allowance	310.8		452.3
Property, plant and equipment, net	78.5		94.3
Deferred tax liabilities	78.5		94.3
Net deferred tax assets	232.3		358.0
Valuation Allowance [Line Items]
Net increase (decrease) in the valuation allowance for deferred tax assets	$ (0.2)		$ 13.7		$ (10.7)	$ (14.9)	$ (1.9)	$ (14.9)	$ (2.1)	$ (1.2)	$ (10.7)

[1] The change in the net valuation allowance was primarily driven by our FMC Peroxygens' foreign operations which are classified as discontinued operations.