Restructuring and Impairment Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring and Impairment [Line Items]
Restructuring expense	$ 23.0	$ 17.9	$ 35.2	$ 33.8
Impairment expense	0.8	60.2	40.2	64.4
Restructuring and impairment expense	23.8	78.1	75.4	98.2
Subsea Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	0.5	14.6	3.0	20.7
Impairment expense	0.5	2.2	2.8	2.6
Surface Technologies
Restructuring and Impairment [Line Items]
Restructuring expense	13.8	1.6	21.6	8.7
Impairment expense	0.3	58.0	36.2	61.8
Energy Infrastructure
Restructuring and Impairment [Line Items]
Restructuring expense	1.1	$ 1.7	3.0	$ 4.4
Corporate and Other
Restructuring and Impairment [Line Items]
Restructuring expense	$ 7.6		7.6
Impairment expense			$ 1.2