Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 35

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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The number of derivative instruments of a particular group held by the entity.

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Interest expense on all other items not previously classified. For example, includes dividends associated with redeemable preferred stock of a subsidiary that is treated as a liability in the parent's consolidated balance sheet.

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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Financial Instruments and Risk Management (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended	1 Months Ended	9 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014	Dec. 31, 2014 item	May 31, 2012	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Repayments of debt	$ 450,000,000us-gaap_RepaymentsOfNotesPayable
Deferred loss charged to income		700,000us-gaap_DerivativeLossOnDerivative
Loss deferred for fair value of interest rate derivative contracts, tax	7,400,000
Number of offsetting positions	0mur_NumberOfOffsettingPositions		0mur_NumberOfOffsettingPositions
10-Year Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Repayments of debt				350,000,000
Debt instrument term	10 years
Scenario, Forecast [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense due to deferred loss on interest rate swaps expected during the remaining nine months of 2015					2,200,000
Commodity Derivative Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of open derivative contracts	0	0
Increase (decrease) of income before taxes due to the impact of marking to market of derivative contracts	(18,800,000)
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss deferred for fair value of interest rate derivative contracts, net of tax	21,100,000
Foreign Exchange Derivative Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (decrease) of income before taxes due to the impact of marking to market of derivative contracts	38,000	3,400,000
Foreign Exchange Derivative Contracts [Member] \| Currency. Malaystion Ringgit [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Short-term derivative instruments		133,500,000
Number of open contracts	0
Foreign Exchange Derivative Contracts [Member] \| Currency, U.S. Dollar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Short-term derivative instruments	$ 15,500,000	$ 23,000,000