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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Equity Method Investments        
Income (loss) from equity affiliates $ 16.4 $ 17.3 $ 70.6 $ 39.4
Subsea        
Schedule of Equity Method Investments        
Income (loss) from equity affiliates 15.7 18.7 52.0 40.4
Onshore/Offshore        
Schedule of Equity Method Investments        
Income (loss) from equity affiliates $ 0.7 $ (1.4) $ 18.6 $ (1.0)