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Debt (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended
Jun. 30, 2013
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Long-term debt fair value   $ 900,000,000us-gaap_LongTermDebtFairValue $ 900,000,000us-gaap_LongTermDebtFairValue
Short-term debt   365,000,000us-gaap_ShortTermBorrowings 0us-gaap_ShortTermBorrowings
Revolving line of credit   175,000,000us-gaap_LineOfCredit 0us-gaap_LineOfCredit
4 Year Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity 1,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
1,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
 
Term of debt instrument 4 years    
Commitment fee   0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
 
Commercial paper      
Debt Instrument [Line Items]      
Term of debt instrument   16 days  
Short-term debt   $ 190,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
$ 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
Short-term debt, average interest rate   0.86%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
 
Revolving line of credit      
Debt Instrument [Line Items]      
Term of debt instrument   71 days  
Short-term debt, average interest rate   1.51%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Minimum | 4 Year Facility      
Debt Instrument [Line Items]      
Commitment fee   0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum | 4 Year Facility      
Debt Instrument [Line Items]      
Commitment fee   0.45%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Indebtedness to cash flow   3.25mhfi_IndebtednessToCashFlow
/ us-gaap_LineOfCreditFacilityAxis
= mhfi_FourYearFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember