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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Cash Flows) (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Net cash provided (used) by operating activities | $ 151.1 | $ (49.3) |  |
Purchase of property, plant and equipment | (294.4) | (42.1) |  |
Deposits for property, plant and equipment | (6.5) | (72.3) |  |
Intercompany investing | 0.0 | 0.0 |  |
Proceeds on sales of assets | 0.0 | 14.6 |  |
Other investing activities | 8.5 | 0.0 |  |
Net cash used by investing activities | (292.4) | (99.8) |  |
Repurchase of common shares | (252.9) | 0.0 |  |
Dividends paid | (28.9) | 0.0 |  |
Proceeds from issuance of debt | 720.9 | 0.0 |  |
Debt issuance costs | (6.8) | (1.5) |  |
Repurchase of debt | (729.3) | (15.3) |  |
Intercompany financing | 0.0 | 0.0 |  |
Other financing activities | (10.9) | (8.9) |  |
Net cash used by financing activities | (307.9) | (25.7) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH | 0.0 | (1.0) |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN OTHER CURRENT ASSETS RELATED TO DISCONTINUED OPERATIONS | (449.2) | (175.8) |  |
DECREASE IN CASH AND CASH EQUIVALENTS FROM DISCONTINUED OPERATIONS, CLASSIFIED WITHIN OTHER CURRENT ASSETS | 3.2 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN CURRENT ASSETS OF DISCONTINUED OPERATIONS | (446.0) | (175.8) |  |
Cash and cash equivalents | 377.2 | 802.5 | $ 823.2 | $ 978.3
Reportable Legal Entities [Member] | Cliffs Shareholders Equity [Member] |  |  |  |
Net cash provided (used) by operating activities | 20.1 | (82.1) |  |
Purchase of property, plant and equipment | (1.2) | (0.3) |  |
Deposits for property, plant and equipment | 0.0 | 0.0 |  |
Intercompany investing | (153.3) | (35.2) |  |
Proceeds on sales of assets |  | 0.0 |  |
Other investing activities | 0.0 |  |  |
Net cash used by investing activities | (154.5) | (35.5) |  |
Repurchase of common shares | (252.9) |  |  |
Dividends paid | (28.9) |  |  |
Proceeds from issuance of debt | 720.9 |  |  |
Debt issuance costs | (6.8) | (1.5) |  |
Repurchase of debt | (729.3) | (15.3) |  |
Intercompany financing | 0.0 | (14.6) |  |
Other financing activities | (14.2) | (1.5) |  |
Net cash used by financing activities | (311.2) | (32.9) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN OTHER CURRENT ASSETS RELATED TO DISCONTINUED OPERATIONS | (445.6) | (150.5) |  |
DECREASE IN CASH AND CASH EQUIVALENTS FROM DISCONTINUED OPERATIONS, CLASSIFIED WITHIN OTHER CURRENT ASSETS | 0.0 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN CURRENT ASSETS OF DISCONTINUED OPERATIONS | (445.6) | (150.5) |  |
Cash and cash equivalents | 374.2 | 798.4 | 819.8 | 948.9
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Net cash provided (used) by operating activities | 134.0 | 83.5 |  |
Purchase of property, plant and equipment | (293.2) | (41.8) |  |
Deposits for property, plant and equipment | (6.3) | (67.6) |  |
Intercompany investing | (1.2) | (5.5) |  |
Proceeds on sales of assets |  | 0.4 |  |
Other investing activities | 8.4 |  |  |
Net cash used by investing activities | (292.3) | (114.5) |  |
Repurchase of common shares | 0.0 |  |  |
Dividends paid | 0.0 |  |  |
Proceeds from issuance of debt | 0.0 |  |  |
Debt issuance costs | 0.0 | 0.0 |  |
Repurchase of debt | 0.0 | 0.0 |  |
Intercompany financing | 152.9 | 31.5 |  |
Other financing activities | 5.1 | (1.0) |  |
Net cash used by financing activities | 158.0 | 30.5 |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN OTHER CURRENT ASSETS RELATED TO DISCONTINUED OPERATIONS | (0.3) | (0.5) |  |
DECREASE IN CASH AND CASH EQUIVALENTS FROM DISCONTINUED OPERATIONS, CLASSIFIED WITHIN OTHER CURRENT ASSETS | 0.0 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN CURRENT ASSETS OF DISCONTINUED OPERATIONS | (0.3) | (0.5) |  |
Cash and cash equivalents | 0.4 | 1.6 | 0.7 | 2.1
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Net cash provided (used) by operating activities | (3.0) | (50.7) |  |
Purchase of property, plant and equipment | 0.0 | 0.0 |  |
Deposits for property, plant and equipment | (0.2) | (4.7) |  |
Intercompany investing | 0.0 | 14.6 |  |
Proceeds on sales of assets |  | 14.2 |  |
Other investing activities | 0.1 |  |  |
Net cash used by investing activities | (0.1) | 24.1 |  |
Repurchase of common shares | 0.0 |  |  |
Dividends paid | 0.0 |  |  |
Proceeds from issuance of debt | 0.0 |  |  |
Debt issuance costs | 0.0 | 0.0 |  |
Repurchase of debt | 0.0 | 0.0 |  |
Intercompany financing | 1.6 | 9.2 |  |
Other financing activities | (1.8) | (6.4) |  |
Net cash used by financing activities | (0.2) | 2.8 |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | (1.0) |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN OTHER CURRENT ASSETS RELATED TO DISCONTINUED OPERATIONS | (3.3) | (24.8) |  |
DECREASE IN CASH AND CASH EQUIVALENTS FROM DISCONTINUED OPERATIONS, CLASSIFIED WITHIN OTHER CURRENT ASSETS | 3.2 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN CURRENT ASSETS OF DISCONTINUED OPERATIONS | (0.1) | (24.8) |  |
Cash and cash equivalents | 2.6 | 2.5 | 2.7 | 27.3
Consolidation, Eliminations [Member] |  |  |  |
Net cash provided (used) by operating activities | 0.0 | 0.0 |  |
Purchase of property, plant and equipment | 0.0 | 0.0 |  |
Deposits for property, plant and equipment | 0.0 | 0.0 |  |
Intercompany investing | 154.5 | 26.1 |  |
Proceeds on sales of assets |  | 0.0 |  |
Other investing activities | 0.0 |  |  |
Net cash used by investing activities | 154.5 | 26.1 |  |
Repurchase of common shares | 0.0 |  |  |
Dividends paid | 0.0 |  |  |
Proceeds from issuance of debt | 0.0 |  |  |
Debt issuance costs | 0.0 | 0.0 |  |
Repurchase of debt | 0.0 | 0.0 |  |
Intercompany financing | (154.5) | (26.1) |  |
Other financing activities | 0.0 | 0.0 |  |
Net cash used by financing activities | (154.5) | (26.1) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN OTHER CURRENT ASSETS RELATED TO DISCONTINUED OPERATIONS | 0.0 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS FROM DISCONTINUED OPERATIONS, CLASSIFIED WITHIN OTHER CURRENT ASSETS | 0.0 | 0.0 |  |
DECREASE IN CASH AND CASH EQUIVALENTS, INCLUDING CASH CLASSIFIED WITHIN CURRENT ASSETS OF DISCONTINUED OPERATIONS | 0.0 | 0.0 |  |
Cash and cash equivalents | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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