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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jan. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Mandatorily redeemable financial liability $ 300.1 $ 268.8   $ 318.3 $ 408.5  
Increase in liability due to one percentage point decrease in discount rate 2.7          
Redeemable Noncontrolling Interest $ 39.5 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 $ 1,946.7 1,981.2        
Debt, fair value 1,893.8 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 Disclosure     $ 104.0      
Property, Plant and Equipment | Fair Value, Nonrecurring [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Property, Plant, and Equipment, Fair Value Disclosure $ 269.6 $ 238.5        
Measurement Input, Discount Rate [Member] | Redeemable financial liability            
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Fair value unobservable input rate 16.80%          
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%