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Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
employee
Dec. 31, 2011
Dec. 31, 2012
Sei Opportunity Collective Fund [Member]
Dec. 31, 2012
Sei Special Situations Fund [Member]
Dec. 31, 2012
Structured Finance [Member]
Dec. 31, 2012
Real Estate [Member]
Dec. 31, 2012
Pension Benefits [Member]
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2010
Pension Benefits [Member]
Dec. 31, 2012
Other Benefits [Member]
Dec. 31, 2011
Other Benefits [Member]
Dec. 31, 2012
Northshore [Member]
Dec. 31, 2012
North American Coal [Member]
Dec. 31, 2011
North American Coal [Member]
Dec. 31, 2010
North American Coal [Member]
Dec. 31, 2012
Defined Benefit Postretirement Health Coverage [Member]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Prior To Age65 [Member]
Dec. 31, 2012
Defined Benefit Postretirement Health Coverage [Member]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
After Age65 [Member]
Dec. 31, 2012
Defined Benefit Postretirement Health Coverage [Member]
Northshore [Member]
After Age65 [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Defined Benefit Postretirement Health Coverage [Member]
Northshore [Member]
Prior To Age65 [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Defined Benefit Postretirement Health Coverage [Member]
Northshore [Member]
Prior To Age65 [Member]
Dec. 31, 2012
United States [Member]
Pension Benefits [Member]
security
Dec. 31, 2011
United States [Member]
Pension Benefits [Member]
Dec. 31, 2012
United States [Member]
Other Benefits [Member]
Dec. 31, 2011
United States [Member]
Other Benefits [Member]
Dec. 31, 2012
Canada [Member]
Pension Benefits [Member]
security
Dec. 31, 2011
Canada [Member]
Pension Benefits [Member]
Dec. 31, 2012
Canada [Member]
Other Benefits [Member]
Dec. 31, 2011
Canada [Member]
Other Benefits [Member]
Feb. 28, 2010
Wabush [Member]
Defined Benefit Plan Disclosure [Line Items] 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Remaining interest percentage prior to acquisition 听 听 听 听 听 听 听 听 听 听 听 100.00% 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 73.20%
Term of labor contracts with USW 37 months 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Number of USW employees covered by labor contracts 2,400 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Percentage of total workforce covered by labor contract 32.00% 听 听 听 听 听 听 听 听 听 听 听 11.00% 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Annual limit on medical coverage for each participant 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 $ 7,000 $ 3,000 $ 2,000 听 $ 4,020 听 听 $ 4,500 听 听 听 听 听 听 听 听 听
Minimum participants percentage 15.00% 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Contribution rate per hour worked 听 听 听 听 听 听 听 听 听 听 听 听 8.10 6.50 6.42 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Annual costs for defined contribution plan 听 听 听 听 听 听 6,700,000 5,700,000 4,200,000 听 听 听 14,900,000 9,500,000 10,300,000 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Funding of bargaining unit pension plans and VEBAs 65,700,000 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Accumulated benefit obligation for defined benefit pension plans 1,204,700,000 1,114,700,000 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Discount rate 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 3.54% 听 听 3.80% 听 3.70% 4.28% 3.70% 4.28% 3.75% 4.00% 4.00% 4.25% 听
Projected yield, number of bonds used 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 506 听 听 听 240 听 听 听 听
Maturity period of security 10 years 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Expected period of long-term return on assets 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 3 years 听 5 years 听 听 听 听 听 听 听 听 听 听 听
Redemption request notice period, days 听 听 65 days 95 days 90 days 45 days 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Withdrawal request notice period, days 听 听 听 听 听 65 days 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Reserve for investment commitments 10,700,000 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听
Participant contributions 听 听 听 听 听 听 $ 0 $ 0 听 $ 4,600,000 $ 4,600,000 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听 听