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Description of Business (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 29, 2012 item | Dec. 31, 2011 item | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2012 item
Description of Business [Abstract] |  |  |  |  |
Number of vessels owned |  |  |  |  | 17
Ownership interest in SSAT (as a percent) |  |  | 35.00% |  | 35.00%
Number of terminal facilities on which SSAT provides terminal and stevedoring services to Matnav and numerous international carriers |  |  |  |  | 6
Number of publicly traded companies to be created after separation |  | 2 |  |  |
Number of businesses wherein assets are segregated under reorganization | 2 |  |  |  |
Maximum ownership interest that may be owned by non-U.S. citizens (as a percent) |  |  |  |  | 22.00%
Maximum period during which services are to be provided under Transition Services Agreement |  |  |  |  | 24
Total cash outflows expected to be incurred in relation to separation |  |  |  |  | $ 165.4
Total capital distributions to A&B (A) |  |  |  |  | 155.7
Separation costs (B) |  |  | 5.8 | 2.5 | 8.3
Capitalized debt financing costs |  |  |  |  | 1.9
Total cash outflow related to the Separation |  |  |  |  | 165.9
Net distribution in relation to separation |  |  | 4.3 |  |
Separation costs, net of tax |  |  | $ 4.8 | $ 2.1 |

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- Definition Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services. + References No definition available. + Details
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- Definition Represents final net distribution expected to be incurred in relation to settlement of liabilities of former parent entity. + References No definition available. + Details
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