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v2.4.1.9

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) |  | 50,000,000 us-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) | 44,500,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_PlanNameAxis = mhfi_TwoThousandThirteenRepurchaseProgramMember |

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