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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |  |
Power plant long-term service agreement |  | $ (9.2) | $ (2.6) | $ 39.5
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |  |
Interest (net of interest capitalized) | [1] | 153.8 | 139.6 | 141.9
Income taxes (net of income tax refunds) |  | 2.8 | (16.0) | (5.9)
Interest costs capitalized |  | $ 11.7 | $ 18.0 | $ 7.5
[1] | Net of interest capitalized of $11.7 million, $18.0 million and $7.5 million in 2018, 2017 and 2016, respectively.

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