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Debt and Other Credit Facilities (Convertible Senior Notes) (Details)
3 Months Ended 6 Months Ended
May 20, 2021
$ / shares
Nov. 15, 2018
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Cash dividends declared per share (usd per share) | $ / shares     $ 0.11 $ 0.10 $ 0.22 $ 0.20  
Nonrecourse project debt   $ 62,000,000 $ 2,000,000   $ 2,000,000   $ 2,000,000
Proceeds from sale of warrants   $ 22,000,000          
Exercise price (usd per share) | $ / shares   $ 40.02 $ 39,820,000   $ 39,820,000    
Convertible Debt | Notes Due 2023              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 350,000,000          
Interest rate, stated percentage   2.50%          
Conversion price (usd per share) | $ / shares   $ 25.51          
Conversion rate 0.0393964 0.0391961          
Cash dividends declared per share (usd per share) | $ / shares $ 0.11            
Convertible stock price (usd per share) | $ / shares $ 25.38            
If-converted value in excess of principal         $ 176,000,000    
Carrying value of the equity component     $ 57,000,000   57,000,000   $ 57,000,000
Interest cost relating to contractual interest coupon     2,000,000 $ 2,000,000 4,000,000 $ 4,000,000  
Interest cost relating to amortization of discount     $ 3,000,000 $ 3,000,000 $ 7,000,000 $ 6,000,000  
Effective percentage     6.50%   6.50%   6.50%