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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jan. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Mandatorily redeemable financial liability $ 219.8 $ 300.1 $ 268.8   $ 412.8 $ 318.3 $ 408.5  
Increase in liability due to one percentage point decrease in discount rate 2.2              
Redeemable Noncontrolling Interest $ 41.1   41.1          
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, carrying value $ 2,149.4   1,981.2          
Debt, fair value 2,206.5   2,078.2          
Island Offshore Subsea AS                
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Redeemable noncontrolling interest, acquired percent               51.00%
Vessels [Member] | Fair Value, Nonrecurring [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Property, Plant, and Equipment, Fair Value       $ 104.0        
Property, Plant and Equipment | Fair Value, Nonrecurring [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Property, Plant, and Equipment, Fair Value $ 314.3   $ 238.5          
Measurement Input, Discount Rate [Member] | Redeemable financial liability                
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Fair value unobservable input rate 20.60%              
Measurement Input, Discount Rate [Member] | Property, Plant and Equipment | Fair Value, Nonrecurring [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions                
Fair value unobservable input rate     10.80%