DISCONTINUED OPERATIONS (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended												3 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Container and charter liabilities	Dec. 31, 2011 Container and charter liabilities	Dec. 31, 2012 Other contractual liabilities	Dec. 31, 2011 Other contractual liabilities	Dec. 31, 2012 CLX2 Service	Dec. 31, 2011 CLX2 Service	Dec. 31, 2010 CLX2 Service	Sep. 30, 2011 CLX2 Service item	Jul. 31, 2012 CLX2 Service Container and charter liabilities item	Sep. 30, 2011 CLX2 Service Other contractual liabilities item	Dec. 31, 2012 A&B	Dec. 31, 2011 A&B	Dec. 31, 2010 A&B	Jun. 29, 2012 A&B	Dec. 31, 2012 A&B Continuing operations	Dec. 31, 2011 A&B Continuing operations	Dec. 31, 2010 A&B Continuing operations	Dec. 31, 2012 A&B Discontinued operations	Dec. 31, 2011 A&B Discontinued operations	Dec. 31, 2010 A&B Discontinued operations
Accounting for and Classification of Discontinued Operations
Number of shares of common stock of A&B received for each share upon separation																									1
Number of vessels used in discontinued operation																			5
Number of vessels expected to be sub-chartered																				2
Number of vessels returned to lessors																					3
Duration of charter contracts																					1 year
Fair value of the obligations arising from exit activities																	$ 4.9
Income (losses) from discontinued operations
Income																	92.7	28.6				116.4	274.7	276.3
Expenses																(4.4)	(149.4)	(47.9)				(118.1)	(243.5)	(244.6)
Tax (expense) benefit																1.6	21.1	7.2				(1.6)	(7.2)	2.0
Net (loss) income from A&B																						(3.3)	24.0	33.7		(4.0)	8.4	(0.4)	2.4	14.3	34.1
(Loss) income from discontinued operations (net of tax)	(0.1)	0.1	(7.5)	1.4	(5.1)	(9.7)	1.0	2.2	(6.1)	(11.6)	21.6
Liabilities of Disposal Group (Including Discontinued Operation)
Balance, beginning of period				4.9					4.9			4.8		0.1
Expenses incurred	4.5				12.5				4.5	12.5		4.5	11.8		0.7
Amounts paid									(9.4)	(7.6)		(9.3)	(7.0)	(0.1)	(0.6)
Balance, end of period					$ 4.9					$ 4.9			$ 4.8		$ 0.1