Accounting for and Classification of Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 CLX2 Service [Member]	Sep. 30, 2011 CLX2 Service [Member]	Mar. 31, 2012 CLX2 Service [Member] Container and Charter Liabilities [Member]	Mar. 31, 2012 CLX2 Service [Member] Other Contractual Liabilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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 (in years)				1Y
Fair value of obligations arising from exit activities			$ 3.0		$ 2.9	$ 0.1
Total Cash And Non Cash Charges Expected To Incur Relating To Discontinued Operations			15.5
Liabilities of Disposal Group, Including Discontinued Operation, Current [Roll Forward]
Balance, beginning of period			5.0		4.9	0.1
Expenses incurred			2.3		2.3	0
Amounts paid			(4.3)		(4.3)	0
Balance, end of period			3.0		2.9	0.1
Discontinued operations (net of tax) [Abstract]
Sales of real estate assets	2.4	3.7
Real estate leasing operations	0	0.4
CLX2 operating and shut down losses	(1.4)	(8.0)
Income from discontinued operations (net of tax)	1.0	(3.9)
Additional costs incurred, net of tax, not classified as discontinued operations	$ 0.2	$ 3.7