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Segment and Geographic Information (Narrative) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 Segment | Dec. 31, 2014 country Segment
Segment Reporting [Abstract] |  |
Number of reportable segments | Segment | 4 | 4
Number of countries in which operations is carried on |  | 80
Maximum percentage of consolidated revenue represented by foreign countries |  | 8.00%
Maximum percentage of consolidated revenue represented by single customer |  | 10.00%

X
- Definition Maximum percentage of consolidated revenue represented by foreign countries. + References No definition available. + Details
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Namespace Prefix: | mhfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of consolidated revenue represented by single customer. + References No definition available. + Details
Name: | mhfi_MaximumPercentageOfConsolidatedRevenueRepresentedBySingleCustomer
Namespace Prefix: | mhfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of countries in which operations is carried on. + References No definition available. + Details
Name: | mhfi_NumberOfCountriesInWhichOperationsIsCarriedOn
Namespace Prefix: | mhfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration