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Commitments and Contingencies (Details)
3 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2003
Jan. 15, 2014
Italian Administrative Court [Member]
EUR (€)
Dec. 31, 2012
Parmalat [Member]
EUR (€)
Jun. 30, 2011
Parmalat [Member]
EUR (€)
Oct. 31, 2005
Parmalat [Member]
EUR (€)
Loss Contingencies [Line Items]              
Equity method investment ownership percentage     45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage        
Deferred gain $ 5,000,000us-gaap_SaleLeasebackTransactionDeferredGainNet $ 60,000,000us-gaap_SaleLeasebackTransactionDeferredGainNet          
Amortized deferred gain 2,000,000us-gaap_SaleLeasebackTransactionRentExpense            
Interest expense (less than $1 million for three months ended September 30, 2014) 1,000,000mhfi_SaleLeasebackTransactionInterestExpense            
Damages sought       234,000,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= mhfi_ItalianAdministrativeCourtMember
     
Damages claimed             4,100,000,000mhfi_DamagesClaimed
/ us-gaap_LitigationCaseAxis
= mhfi_ParmalatMember
Rating fees paid         € 1,100,000mhfi_RatingFeesPaid
/ us-gaap_LitigationCaseAxis
= mhfi_ParmalatMember
€ 800,000mhfi_RatingFeesPaid
/ us-gaap_LitigationCaseAxis
= mhfi_ParmalatMember