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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jan. 29, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Mandatorily redeemable financial liability $ 401.3 $ 401.3 $ 301.1   $ 312.0 $ 174.8
Unobservable inputs reconciliation, recurring basis, liability, gain (loss) included in earnings (93.2) (213.5) $ (202.9)      
Increase in liability due to one percentage point decrease in discount rate 7.2 7.2        
Redeemable Noncontrolling Interest 39.7 39.7     0.0  
Debt, carrying value 2,026.2 2,026.2     2,043.8  
Debt, fair value 2,229.2 2,229.2     $ 2,308.2  
Island Offshore Subsea AS | Non- controlling Interest            
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Redeemable noncontrolling interest, acquired percent       51.00%    
Fair Value, Measurements, Recurring            
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Redeemable Noncontrolling Interest $ 39.7 $ 39.7