Cash Flow Information (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Capital additions		$ 553.3	$ 154.2
Cash paid for capital expenditures		478.9	150.1
Difference		74.4	4.1
Non-cash accruals		74.4	4.1
Capital leases		0	0
Total		74.4	4.1
Gain on remeasurement of equity interest before acquisition	2.1		40.7
Freewest And Wabush [Member]
Number of shares issued in acquisition			4.2
Value of shares issued in acquisition			173.1
Gain on remeasurement of equity interest before acquisition			$ 38.6