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Stockholders' Equity (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 2 Months Ended 11 Months Ended 12 Months Ended 36 Months Ended 1 Months Ended 2 Months Ended
Dec. 31, 2014
Oct. 01, 2013
Dec. 31, 2013
Apr. 30, 2014
Dec. 31, 2011
Nov. 21, 2014
Dec. 31, 2012
Nov. 21, 2014
Dec. 31, 2014
Feb. 23, 2015
Jul. 24, 2013
Oct. 25, 2011
Oct. 22, 2014
Merger Agreement and Purchase Agreement                          
Vesting period 3 years                        
Partners Rx                          
Merger Agreement and Purchase Agreement                          
Number of restricted stock purchased by certain principal owners of the acquiree   175,596us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mgln_PartnersRxManagementLLCMember
175,596us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mgln_PartnersRxManagementLLCMember
                   
Purchase price of restricted stock   $ 10us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= mgln_PartnersRxManagementLLCMember
                     
Trading day period to calculate average of the closing prices of the company's stock   5 days                      
Vesting period of restricted stock issued   3 years                      
Vesting percentage on the second anniversary of the acquisition   50.00%mgln_BusinessAcquisitionVestingRightsPercentageOnSecondAnniversaryOfAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mgln_PartnersRxManagementLLCMember
                     
Vesting percentage on the third anniversary of the acquisition   50.00%mgln_BusinessAcquisitionVestingRightsPercentageOnThirdAnniversaryOfAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mgln_PartnersRxManagementLLCMember
                     
CDMI                          
Merger Agreement and Purchase Agreement                          
Number of restricted stock purchased by certain principal owners of the acquiree 1,433,946us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
    1,433,946us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
                 
Purchase price of restricted stock       80us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
                 
Trading day period to calculate average of the closing prices of the company's stock       5 days                  
Vesting period of restricted stock issued       42 months                  
CDMI | 25% vesting                          
Merger Agreement and Purchase Agreement                          
Vesting period       18 months                  
Vested and expected to vest for the period (as a percent)       25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
                 
CDMI | 75% vesting                          
Merger Agreement and Purchase Agreement                          
Vesting period       42 months                  
Vested and expected to vest for the period (as a percent)       75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_BusinessAcquisitionAxis
= mgln_CDMILLCMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
                 
October 2011 Share Repurchase Program                          
Stock Repurchases                          
Amount authorized under stock repurchase plan                     300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
200.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
 
Total number of Shares Purchased     1,159,871mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
  671,776mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
3,183,306mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
459,252mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
5,474,205mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
         
Average Price Paid per Share (in dollars per share)     51.83us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
  $ 48.72us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
$ 57.82us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
$ 50.27us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
           
Aggregate Cost     60.1mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
  32.7mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
184.1mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
23.1mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
300.0mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2011Member
         
October 2014 Share Repurchase Program                          
Stock Repurchases                          
Amount authorized under stock repurchase plan                         200.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member
Total number of Shares Purchased                 232,170mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member
352,592mgln_SharesRepurchasedOpenMarketPurchasesMadeShares
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member
     
Average Price Paid per Share (in dollars per share)                 $ 60.65us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member
       
Aggregate Cost                 $ 14.1mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member
$ 21.3mgln_SharesRepurchasedValueExcludingBrokerCommissions
/ us-gaap_ShareRepurchaseProgramAxis
= mgln_ShareRepurchaseProgramOctober2014Member