XML 76 R64.htm IDEA: XBRL DOCUMENT v2.4.1.9
Recently Issued and Proposed Accounting Pronouncements (Details) (The amendments ASU 2015-03 debt issuance costs, USD $)
In Millions, unless otherwise specified
 0 Months Ended
Mar. 31, 2015
The amendments ASU 2015-03 debt issuance costs
  
Reclassified debt issuance costs $ 5.7amag_DebtIssuanceCostsReclassifiedToReductionInCarryingAmountOfDebt
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementMember