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Leases (Notes)	3 Months Ended
Leases (Notes)	Mar. 31, 2014
Leases [Abstract]
Leases	Leases In November 2012, we entered into a lease agreement for office and laboratory space to be constructed in New Haven, Connecticut. Although we will not legally own the premises, we are deemed to be the owner of the building during the construction period based on applicable accounting guidance for build-to-suit leases due to our involvement during the construction period. Accordingly, the landlord's costs of constructing the facility are required to be capitalized, as a non-cash transaction, offset by a corresponding facility lease obligation in our condensed consolidated balance sheet. Construction of the new facility began in June 2013 and is expected to be completed in 2015. As of March 31, 2014, we recorded a construction-in-process asset of $39,818, inclusive of the landlord's costs as well as costs incurred by Alexion, and an offsetting facility lease obligation of $38,417 associated with the new facility.

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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