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v3.21.2

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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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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