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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Contribution from former related party			$ 154.5alex_ContributionFromFormerRelatedParty
Affiliated Entity
Related Party Transaction [Line Items]
Vessel management services expenses	0	0	(2.0)
Lease income from affiliate	0	0	2.1
Equipment and repair services income and other	0	0	1.4
Related party revenue, net	0	0	1.5
Materials & Construction
Related Party Transaction [Line Items]
Related party revenue, net	23.9	7.9
Receivable from affiliates	$ 3.0	$ 3.3

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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