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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Jan. 29, 2018
Jan. 29, 2018
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 268.8 $ 408.5 $ 312.0       $ 174.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (423.1) (322.3) $ (293.7)        
Redeemable noncontrolling interest 41.1 $ 38.5          
Sensitivity analysis of fair value, increase in liabilities, impact of 1 percent increase in discount rate $ 3.4            
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              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         51.00% 51.00%  
Vessels              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Property, Plant, and Equipment, Fair Value Disclosure       $ 104.0      
Plant, property and equipment              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Weighted Average Discount Rate 10.80%            
Property, Plant, and Equipment, Fair Value Disclosure $ 238.5