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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Cash Flow Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Text Block [Abstract] |  |  |  |
Capital additions |  | $ 689.8 | $ 394.8 | $ 156.0
Non-cash accruals |  | 15.3 | 93.6 | (2.2)
Right-of-use asset - finance leases |  | 29.3 | 7.6 | 6.5
Grants |  | (10.8) | (2.5) | 0.0
Payments To Acquire Property Plant And Equipment Net |  | 656.0 | 296.1 | 151.7
Capital expenditure related to discontinued operations |  | 0.0 | 0.1 | 2.8
Taxes paid on income |  | 0.2 | 2.9 | 1.7
Income tax refunds |  | (117.9) | (11.3) | (7.8)
Interest paid on debt obligations net of capitalized interest |  | 97.6 | 105.7 | 139.0
Capitalized interest |  | $ 24.8 | $ 6.5 | $ 0.0
Common Stock, Dividends, Per Share, Declared | $ 0.06 | $ 0.27 | $ 0.05 | $ 0
Dividends Payable | $ 16.2 | $ 16.2 |  |

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