Earnings Per Share (Reconciliation Of Number Of Shares Used For Basic And Diluted Earnings Per Share ("EPS") Calculation ) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to FMC Technologies, Inc.	$ 168.6		$ 169.8		$ 226.3		$ 135.2		$ 177.8		$ 116.0		$ 105.2		$ 102.4		$ 699.9	$ 501.4	$ 430.0
Weighted average number of shares outstanding																	236.3	238.3	239.7
Dilutive effect of restricted stock units and stock options																	0.6	0.8	1.2
Total shares and dilutive securities																	236.9	239.1	240.9
Basic earnings per share attributable to FMC Technologies, Inc.	$ 0.72	[1]	$ 0.72	[1]	$ 0.96	[1]	$ 0.57	[1]	$ 0.75	[1]	$ 0.49	[1]	$ 0.44	[1]	$ 0.43	[1]	$ 2.96	$ 2.10	$ 1.79
Diluted earnings per share attributable to FMC Technologies, Inc.	$ 0.72	[1]	$ 0.72	[1]	$ 0.95	[1]	$ 0.57	[1]	$ 0.74	[1]	$ 0.49	[1]	$ 0.44	[1]	$ 0.43	[1]	$ 2.95	$ 2.10	$ 1.78

[1] Basic and diluted EPS are independently computed for each of the periods presented. Accordingly, the sum of the quarterly EPS amounts may not agree to the annual total.