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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Jan. 29, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Mandatorily redeemable financial liability $ 412.8 $ 318.3 $ 408.5 $ 308.1 $ 383.2   $ 312.0
Increase in liability due to one percentage point decrease in discount rate 3.3            
Redeemable Noncontrolling Interest $ 38.5   38.5        
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 $ 1,983.8   1,998.6        
Debt, fair value $ 2,155.7   $ 2,109.7        
Island Offshore Subsea AS | Non-controlling Interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions              
Redeemable noncontrolling interest, acquired percent           51.00%