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Commitments and Contingencies (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2005 USD ($) | Dec. 31, 2019 USD ($) claim defendant case | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 01, 2019 USD ($) | Nov. 01, 2019 BRL (R$) | Mar. 19, 2019 USD ($) | Mar. 19, 2019 BRL (R$) | Dec. 31, 2018 USD ($)
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 195,000,000 |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  | $ 7,000,000.0 |  |  |  |  |  |  |
Penalties per day |  |  |  |  | $ 6,000 | R$ 25,000 | $ 1,300 | R$ 5,000 |
Penalties |  |  |  |  | 2,500,000 | 10,000,000 |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 35.00% |  |  |  |  |  |  |
Loss contingency, Brazilian labor claims |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Liabilities for asserted and unasserted claims |  | $ 6,500,000 |  |  |  |  |  |  | $ 7,100,000
Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  | 17,142 |  |  |  |  |  |  |
Loss provision |  | $ 0 |  |  |  |  |  |  |
Loss Contingency, Number of Defendants | defendant |  | 90 |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number | case |  | 28,227 |  |  |  |  |  |  |
Other | Minimum |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 20,000,000 |  |  |  |  |  |  |
Other | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 25,000,000 |  |  |  |  |  |  |
Pending Litigation, Active Or In Extremis Docket | Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  | 45 |  |  |  |  |  |  |
Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2004 To May 2005 |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Principal Amount |  | $ 2,000,000 |  |  |  |  |  |  |
Estimated claims or assessment, additional amount |  | 21,000,000 |  |  |  |  |  |  |
Loss Contingency, Reduced Penalty |  | 2,000,000 |  |  |  |  |  |  |
Loss Contingency, Reduced Penalty, Including Interest |  | 9,000,000 |  |  |  |  |  |  |
Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2002 To December 2003 |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Principal Amount | $ 1,500,000 |  |  |  |  |  |  |  |
Estimated claims or assessment, additional amount | 4,800,000 |  |  |  |  |  |  |  |
Loss Contingency, Reduced Penalty |  | 1,200,000 |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 6,300,000 | 12,000,000 |  |  |  |  |  |  |
Loss provision |  | $ 0 |  |  |  |  |  |  |
New York County as managed by the New York Supreme Court | Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | case |  | 16,595 |  |  |  |  |  |  |
New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket | Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | claim |  | 16,550 |  |  |  |  |  |  |
New York State Supreme Court, Counties Excluding New York County [Member] | Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | case |  | 117 |  |  |  |  |  |  |
Courts Located In States Other Than New York | Other |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Number of pending claims | case |  | 430 |  |  |  |  |  |  |
NETHERLANDS |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Estimated claims or assessment, additional amount |  | $ 500,000 |  |  |  |  |  |  |
Allegheny County Health Department [Member] |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Estimated claims or assessment, additional amount |  | 107,020 |  |  |  |  |  |  |
Pennsylvania Department Of Environmental Protection, Processed Slag [Member] |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Liabilities for asserted and unasserted claims |  | $ 400,000 |  |  |  |  |  |  |
Consolidated Revenue, Net [Member] | Subsidiary Concentration Risk [Member] |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Concentration risk |  |  | 2.00% | 2.00% |  |  |  |  |
CSN [Member] |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |
Penalties per day |  |  |  |  | $ 25,000 | R$ 100,000 |  | R$ 20,000 |

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