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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |  |
Power plant long-term service agreement |  | $ 28.9 | $ (9.2) | $ (2.6)
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |  |
Interest (net of interest capitalized) | [1] | 152.2 | 153.8 | 139.6
Income taxes (net of income tax refunds) |  | 5.5 | 2.8 | (16.0)
Interest costs capitalized |  | $ 2.8 | $ 11.7 | $ 18.0
[1] | Net of interest capitalized of $2.8 million, $11.7 million and $18.0 million in 2019, 2018 and 2017, respectively.

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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