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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross | [1] | $ 5,885.8 |  | $ 5,885.8 |  | $ 3,027.4
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment |  | 1,337.9 |  | 1,337.9 |  | 1,098.4
Property, plant and equipment, net |  | 4,547.9 |  | 4,547.9 |  | 1,929.0
Finance Lease, Right-of-Use Asset |  | 93.7 |  | 93.7 |  | 49.0
Interest Costs Capitalized |  | 13.6 | $ 5.9 | 23.3 | $ 9.9 |
Depreciation and depletion expense |  | 75.3 | $ 20.9 | 110.7 | $ 40.5 |
Land, Land Improvements and Mineral Rights [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | 653.2 |  | 653.2 |  | 582.2
Building [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | 454.4 |  | 454.4 |  | 157.8
Steel and Manufacturing Equipment [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | 2,147.9 |  | 2,147.9 |  | 42.0
Mining and Pelletizing Equipment [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | 1,448.6 |  | 1,448.6 |  | 1,413.6
Other Assets [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | 123.4 |  | 123.4 |  | 101.5
Construction in Progress [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  | $ 1,058.3 |  | $ 1,058.3 |  | $ 730.3
[1] | 1 Includes right-of-use assets related to finance leases of $93.7 million and $49.0 million as of June 30, 2020 and December 31, 2019, respectively.

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