Pension and Other Post-Retirement Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 59.6	$ 62.7
Deferred compensation investments	41.6	35.6
FMC Technologies stock held in trust	7.7	7.8
U.S. Pensions
Defined Benefit Plan Disclosure [Line Items]
Company contributions	29.5	31.9
U S qualified plan U K and Canadian plans
Defined Benefit Plan Disclosure [Line Items]
Item as a percentage of total pension assets (as a percent)	89.00%
International pension plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions	21.0
U.S. nonqualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Expected contributions	9.0
U S qualified pension plan
Defined Benefit Plan Disclosure [Line Items]
Company contributions	18.0	13.5
Nonelective contributions
Defined Benefit Plan Disclosure [Line Items]
Vesting service	3 years
Expenses recognized	16.2	11.8	8.4
Non qualified deferred compensation plan
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation liability	38.5	34.4
Deferred compensation investments	29.1	26.0
Matching contribution
Defined Benefit Plan Disclosure [Line Items]
Expenses recognized	$ 23.5	$ 18.4	$ 14.6
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting service for current nonunion employees	5 years