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Business Combination Transactions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 18, 2018
Mar. 31, 2018
Jan. 29, 2018
Series of individually immaterial business acquisitions      
Business Acquisition      
Consideration transferred   $ 19.6  
Non- controlling Interest | Island Offshore Subsea AS      
Business Acquisition      
Redeemable noncontrolling interest, acquired percent     51.00%
Cash consideration $ 42.4    
Goodwill, acquired $ 85.0