Restructuring and Impairment Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring and Impairment [Line Items]
Restructuring expense	$ 5.9	$ 6.5
Impairment expense	34.4	3.9
Restructuring and impairment expense	40.3	10.4
Subsea Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	0.1	0.7
Impairment expense	0.1	0.3
Surface Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	3.9	4.4
Impairment expense	34.3	3.6
Energy Infrastructure
Restructuring and Impairment [Line Items]
Restructuring expense	$ 1.9	$ 1.4