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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Cash Flow Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 15, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 13, 2020
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Capital additions |  |  | $ 157.7 | $ 129.3 |
Non-cash accruals |  |  | (10.3) | (11.5) |
Right-of-use assets obtained in exchange for new finance lease liabilities1 | [1] |  | 29.9 | 15.1 |
Grants |  |  | 0.0 | (8.4) |
Cash paid for capital expenditures including deposits |  |  | 138.1 | 134.1 |
Taxes paid on income |  |  | 0.1 | 0.1 |
Income tax refunds |  |  | (60.4) | 0.0 |
Interest paid on debt obligations net of capitalized interest | [2] |  | 29.7 | 39.2 |
Capitalized interest | [2] |  | 9.7 | 4.0 |
Fair value of Cliffs equity issued for business combination |  |  |  |  | $ 617.6
Dividends Declared, Common Stock |  |  | $ 24.0 | $ 14.5 |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.06 | $ 0.05 |
Share-based Payment Arrangement [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Fair value of Cliffs equity issued for business combination |  |  |  | $ 0.0 | 4.3
Common Stock [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Fair value of Cliffs equity issued for business combination |  |  |  | $ 0.0 | $ 617.6
Subsequent Event [Member] |  |  |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |  |  |
Dividends, Common Stock, Cash |  | $ 23.9 |  |  |
[1] | 1 Does not include right-of-use assets obtained in the Merger of $5.3 million for the three months ended March 31, 2020.
[2] | 1 Capitalized interest was $9.7 million and $4.0 million for the three months ended March 31, 2020 and 2019, respectively.

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