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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 29, 2018
Jan. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ (322.3) $ (293.7)    
Redeemable noncontrolling interest 38.5 $ 0.0    
Sensitivity analysis of fair value, increase in liabilities, impact of 1 percent increase in discount rate $ 5.4      
Credit-risk-related contingent features we have no credit-risk-related contingent features in our agreements with the financial institutions that would require us to post collateral for derivative positions in a liability position      
Noncontrolling Interest | Island Offshore Subsea AS [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     51.00% 51.00%