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Business Combination Transactions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Sep. 30, 2018
Sep. 30, 2018
Business Acquisition      
Gain (Loss) on Disposition of Stock in Subsidiary   $ 27.8  
Island Offshore Subsea AS      
Business Acquisition      
Business Acquisition, Percentage of Voting Interests Acquired 51.00%    
Cash consideration $ 42.4    
Goodwill, acquired $ 85.0    
Series of individually immaterial business acquisitions      
Business Acquisition      
Consideration transferred     $ 61.0