Cash Flow Information (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Supplemental Cash Flow Information [Abstract]
Capital additions	$ 354.5	$ 255.9	$ 974.0	[1]	$ 553.3	[1]
Cash paid for capital expenditures			793.6		478.9
Difference			180.4		74.4
Non-cash accruals			125.1		74.4
Capital leases			55.3		0
Total			$ 180.4		$ 74.4

[1] Includes capital lease additions and non-cash accruals. Refer to NOTE 21 - CASH FLOW INFORMATION