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v2.4.1.9

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 |  | $ 900,000,000 us-gaap_LongTermDebtFairValue | $ 900,000,000 us-gaap_LongTermDebtFairValue
Short-term debt |  | 365,000,000 us-gaap_ShortTermBorrowings | 0 us-gaap_ShortTermBorrowings
Revolving line of credit |  | 175,000,000 us-gaap_LineOfCredit | 0 us-gaap_LineOfCredit
4 Year Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 1,000,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = mhfi_FourYearFacilityMember | 1,000,000,000.0 us-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 |  | $ 190,000,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember | $ 0 us-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 |  | 3.25 mhfi_IndebtednessToCashFlow / us-gaap_LineOfCreditFacilityAxis = mhfi_FourYearFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Indebtedness to cash flow ratio + References No definition available. + Details
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Balance Type: | na
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- Details
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Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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