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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Jan. 29, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 246.6 $ 268.8 $ 408.5     $ 312.0
Weighted Average Discount Rate 15.00%          
Property, Plant, and Equipment, Fair Value Disclosure [1] $ 464.7 342.5 [2]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (202.0) (423.1) $ (322.3)      
Redeemable non-controlling interest $ 43.7 41.1        
Sensitivity analysis of fair value, increase in liabilities, impact of 1 percent increase in discount rate       $ 2.0    
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          
Level 2            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Property, Plant, and Equipment, Fair Value Disclosure [2]   $ 104.0        
Island Offshore Subsea AS            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         51.00%  
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%  
Plant, property and equipment            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Weighted Average Discount Rate 10.80% 10.80%        
[1] Measured as of the impairment date using the income approach and a 10.8% risk-adjusted rate of interest, resulting in a Level 3 fair value measurement.
[2] Includes $104.0 million fair value of vessels determined using the transaction price of a similar vessel, resulting in a Level 2 fair value measurement.