Restructuring and Impairment Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring and Impairment [Line Items]
Restructuring expense	$ 6.3	$ 9.3	$ 12.2	$ 15.8
Impairment expense	5.0	0.4	39.4	4.3
Restructuring and impairment expense	11.3	9.7	51.6	20.1
Subsea Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	2.4	5.4	2.5	6.1
Impairment expense	2.2	0.2	2.3	0.5
Surface Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	3.9	2.6	7.8	7.0
Impairment expense	1.6	0.2	35.9	3.8
Energy Infrastructure
Restructuring and Impairment [Line Items]
Restructuring expense		$ 1.3	1.9	$ 2.7
Corporate and Other
Restructuring and Impairment [Line Items]
Impairment expense	$ 1.2		$ 1.2