ASSETS CONSTRUCTED FOR OTHERS (TERMINAL 6 AT LAX) (DETAILS) (USD $) In Millions, unless otherwise specified			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Subsequent Event [Member]	Sep. 30, 2012 LAX airport project proprietary assets [Member]	Dec. 31, 2011 LAX airport project proprietary assets [Member]	Sep. 30, 2012 LAX airport project assets constructed for other [Member]	Dec. 31, 2011 LAX airport project assets constructed for other [Member]	Sep. 30, 2012 LAX airport project total cost [Member]	Dec. 31, 2011 LAX airport project total cost [Member]	Sep. 30, 2012 LAX airport project reimbursement [Member]	Dec. 31, 2011 LAX airport project reimbursement [Member]	Sep. 30, 2012 LAX airport project capitalized interest [Member]	Dec. 31, 2011 LAX airport project capitalized interest [Member]
Sale Leaseback Transaction [Line Items]
Other property and equipment				$ 16.8	$ 8.7	$ 201.4	$ 143.4	$ 218.2	$ 152.1			$ 6.0	$ 4.5
Other liabilities	213.0	176.7								53.6	17.7
Payments received from LAWA			$ 158.1