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Fair Value Measurements (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jan. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Mandatorily redeemable financial liability $ 281,700,000 $ 219,800,000 $ 268,800,000 $ 288,800,000 $ 412,800,000 $ 408,500,000  
Increase in liability due to one percentage point decrease in discount rate 2,600,000            
Redeemable Noncontrolling Interest $ 42,100,000   41,100,000        
Derivative, Credit Risk Related Contingent Features, Existence and Nature 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.            
Debt, fair value $ 2,159,400,000   $ 2,078,200,000        
Island Offshore Subsea AS | Island Offshore Subsea AS              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Redeemable noncontrolling interest, acquired percent             51.00%
Vessels | Fair Value, Nonrecurring              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Property, Plant, and Equipment, Fair Value       104.0      
Property, Plant and Equipment | Fair Value, Nonrecurring              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Property, Plant, and Equipment, Fair Value $ 353,300,000     $ 104,000,000.0 [1]      
Measurement Input, Discount Rate | Redeemable financial liability              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Fair value unobservable input rate 15.00%            
Measurement Input, Discount Rate | Property, Plant and Equipment | Fair Value, Nonrecurring              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Fair value unobservable input rate 10.80%     10.80%      
[1] 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.