CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 249.6	$ 490.3
Short-term investments, at cost which approximates market	0.8us-gaap_ShortTermInvestments	15.8us-gaap_ShortTermInvestments
Accounts receivable, less allowance for doubtful accounts - 2014 - 3.6; 2013 - 1.7	412.6us-gaap_AccountsReceivableNetCurrent	204.4us-gaap_AccountsReceivableNetCurrent
Inventories	211.8us-gaap_InventoryNet	89.2us-gaap_InventoryNet
Prepaid expenses	25.6us-gaap_PrepaidExpenseCurrent	9.5us-gaap_PrepaidExpenseCurrent
Other current assets	24.2us-gaap_OtherAssetsCurrent	5.9us-gaap_OtherAssetsCurrent
Total current assets	924.6us-gaap_AssetsCurrent	815.1us-gaap_AssetsCurrent
Property, plant and equipment, less accumulated depreciation and depletion	1,182.1us-gaap_PropertyPlantAndEquipmentNet	306.1us-gaap_PropertyPlantAndEquipmentNet
Goodwill	770.9us-gaap_Goodwill	64.4us-gaap_Goodwill
Intangible assets	212.1	3.0
Deferred income taxes	55.6us-gaap_DeferredTaxAssetsNetNoncurrent	16.8us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets and deferred charges	81.4us-gaap_OtherAssetsNoncurrent	12.1us-gaap_OtherAssetsNoncurrent
Total assets	3,226.7us-gaap_Assets	1,217.5us-gaap_Assets
Current liabilities:
Short-term debt	5.6us-gaap_ShortTermBorrowings	5.5us-gaap_ShortTermBorrowings
Current maturities of long-term debt	0.3us-gaap_LongTermDebtCurrent	8.2us-gaap_LongTermDebtCurrent
Accounts payable	170.4us-gaap_AccountsPayableCurrent	94.9us-gaap_AccountsPayableCurrent
Income taxes payable	27.0us-gaap_TaxesPayableCurrent	7.1us-gaap_TaxesPayableCurrent
Accrued compensation and related items	73.8	37.9
Other current liabilities	75.8us-gaap_OtherLiabilitiesCurrent	27.3us-gaap_OtherLiabilitiesCurrent
Total current liabilities	352.9us-gaap_LiabilitiesCurrent	180.9us-gaap_LiabilitiesCurrent
Long-term debt, net of unamortized discount	1,455.5us-gaap_LongTermDebtNoncurrent	75.0us-gaap_LongTermDebtNoncurrent
Deferred income taxes	314.5	0
Accrued pension and postretirement benefits	146.5	57.9
Other non-current liabilities	68.4us-gaap_OtherLiabilitiesNoncurrent	29.3us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	2,337.8us-gaap_Liabilities	343.1us-gaap_Liabilities
Shareholders' equity:
Preferred stock, without par value; 1,000,000 shares authorized; none issued	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, par value at $0.10 per share; 100,000,000 shares authorized; Issued 47,855,496 shares in 2014 and 47,555,927 shares in 2013	4.8us-gaap_CommonStockValue	4.7us-gaap_CommonStockValue
Additional paid-in capital	373.0us-gaap_AdditionalPaidInCapital	361.5us-gaap_AdditionalPaidInCapital
Retained earnings	1,191.8	1,106.3
Accumulated other comprehensive loss	(112.9)	(31.3)
Less common stock held in treasury, at cost; 13,205,741 shares in 2014 and 2013	(593.7)us-gaap_TreasuryStockValue	(593.7)us-gaap_TreasuryStockValue
Total MTI shareholders' equity	863.0us-gaap_StockholdersEquity	847.5us-gaap_StockholdersEquity
Non-controlling interest	25.9us-gaap_MinorityInterest	26.9us-gaap_MinorityInterest
Total shareholders' equity	888.9	874.4
Total liabilities and shareholders' equity	$ 3,226.7	$ 1,217.5

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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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.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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