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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%

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