|
Related Parties (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Sep. 30, 2012
|
Dec. 31, 2011
|
Sep. 30, 2012
U.S. Iron Ore [Member]
Facility
|
Sep. 30, 2012
Eastern Canadian Iron Ore [Member]
Facility
|
Sep. 30, 2012
Eastern Canadian Iron Ore [Member]
Facility
|
Sep. 30, 2012
U.S. Iron Ore [Member]
Facility
|
|
| Segment Reporting Information [Line Items] | ||||||
| Number of mines (in number of facilities) | 5 | 2 | 1 | 3 | ||
| Accounts receivable and derivative assets related parties | $ 120.6 | $ 180.4 | ||||
| Other current liabilities related parties | $ 17.4 | $ 43.0 | ||||
| X | ||||||||||
|
- Definition
Accounts receivable and derivative assets related parties No definition available.
|
| X | ||||||||||
|
- Definition
Number of mines No definition available.
|
| X | ||||||||||
|
- Definition
Other current liabilities related parties No definition available.
|
| X | ||||||||||
|
- Details
|