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Other Non-Operating Interest (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Component of Other Expense Income Nonoperating [Line Items]
Foreign Currency	$ 0	$ 1.0
Legacy Tax Liabilities	0mco_LegacyTaxLiabilities	0mco_LegacyTaxLiabilities
Income Loss From Joint Venture	1.9	1.8
Other Non Operating Income Expense Other	0.6mco_OtherNonOperatingIncomeExpenseOther	(0.4)mco_OtherNonOperatingIncomeExpenseOther
Other non-operating income (expense), net	$ 2.5us-gaap_OtherNonoperatingIncomeExpense	$ 2.4us-gaap_OtherNonoperatingIncomeExpense

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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