Commitments and Contingencies (Details)		1 Months Ended	6 Months Ended
	Jun. 04, 2018 USD ($)	Aug. 31, 2005 USD ($)	Jun. 30, 2021 USD ($) case defendant claim enforcementAction	Dec. 31, 2020 USD ($)	Dec. 30, 2020 USD ($)	Jan. 27, 2020 party	Nov. 01, 2019 USD ($)	Nov. 01, 2019 BRL (R$)	Mar. 18, 2019 USD ($)	Mar. 18, 2019 BRL (R$)
Commitments and Contingencies
Number Of Potentially Related Parties | party						20
Reserve for loss contingencies			$ 7,000,000.0
Penalties per day							$ 5,000	R$ 25,000	$ 1,000	R$ 5,000
Penalties							2,000,000	10,000,000
Current Portion of Environmental Liabilities			7,066,000	$ 6,933,000
Environmental liabilities			29,046,000	29,424,000
Total environmental liabilities			$ 36,112,000	36,357,000
Enforcement Actions | enforcementAction			3
Netherlands
Commitments and Contingencies
Damages sought - interest, penalties and fees			$ 700,000
BRAZIL
Commitments and Contingencies
Loss Contingencies, Unpaid Service Taxes					$ 2,100,000
Loss Contingencies, Overall Liability			3,600,000
Brazilian Tax Disputes - Jan 2004 through May 2005 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - interest, penalties and fees			17,200,000
Damages sought - principal			1,200,000
Loss contingency, reduced penalty	$ 1,200,000
Amount of damages sought	$ 7,000,000
Brazilian Tax Disputes - Jan 2002 through Dec 2003 | Sao Paulo State Revenue Authority
Commitments and Contingencies
Damages sought - interest, penalties and fees		$ 3,900,000
Damages sought - principal		1,200,000
Loss contingency, reduced penalty		900,000
Amount of damages sought		5,100,000
Loss contingency, reduced penalty, including interest		$ 6,000,000.0
Brazilian Labor Claims
Commitments and Contingencies
Loss contingency reserves			$ 4,100,000	$ 4,300,000
Other
Commitments and Contingencies
Approximate number of defendants that includes the company named in legal actions | defendant			90
Number of pending claims | claim			17,200
Number of claims dismissed to date by stipulation or summary judgment prior to trial | case			28,330
Other | Active or In Extremis docket
Commitments and Contingencies
Number of pending claims | claim			60
Other | Minimum
Commitments and Contingencies
Amount of damages sought			$ 20,000,000
Other | Maximum
Commitments and Contingencies
Amount of damages sought			$ 25,000,000
Other | New York County as managed by the New York Supreme Court
Commitments and Contingencies
Number of pending claims | case			16,610
Other | New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket
Commitments and Contingencies
Number of pending claims | claim			16,550
Other | New York State Supreme Court, Counties Excluding New York County
Commitments and Contingencies
Number of pending claims | case			120
Other | Courts Located In States Other Than New York
Commitments and Contingencies
Number of pending claims | case			470
CSN
Commitments and Contingencies
Penalties per day							$ 20,000	R$ 100,000	$ 4,000	R$ 20,000