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Equity (Narrative) (Details)
3 Months Ended
Mar. 31, 2015
Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Interest in joint venture minimum percentage 20.00%mhfi_InterestInJointVentureMinimumPercentage  
Agreement terms, change of control, put option for minority interest ownership, effective period 15 days  
2013 Repurchase Program    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock repurchase program number of shares authorized to be repurchased (in shares)   50,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_PlanNameAxis
= mhfi_TwoThousandThirteenRepurchaseProgramMember
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock   18.00%mhfi_MaximumNumberOfSharesAuthorizedForRepurchaseUnderStockRepurchasePlanAsPercentageOfOutstandingCommonStock
/ us-gaap_PlanNameAxis
= mhfi_TwoThousandThirteenRepurchaseProgramMember
Remaining shares available under repurchase program (in shares) 44,500,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_PlanNameAxis
= mhfi_TwoThousandThirteenRepurchaseProgramMember