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The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 false2Value of initial shares received8false 4us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShareus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10truefalsefalse38.6838.68USD$falsetruefalsenum:perShareItemTypedecimalThe price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 false3Initial price per share of stock repurchased under the ASR agreement (in dollars per share)9false 4mw_PaymentsForAcceleratedShareRepurchaseOfCommonStockRecordedAsForwardContractmw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10truefalsefalse1500000015000000falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the portion of the initial payment for an accelerated share repurchase that is in excess of the value of the initial shares received and is recorded as a forward contract within capital in excess of par.No definition available.false2Remainder of ASR recorded as forward contract within capital in excess of par10false 4us-gaap_TreasuryStockSharesAcquiredus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse53785378falsefalsefalse4truefalsefalse70417041falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse11214841121484falsefalsefalse8falsefalsefalse00falsefalsefalse9truefalsefalse14893181489318falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesNumber of shares that have been repurchased during the period and are being held in treasury.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 false1Shares repurchased and held in treasury11false 4us-gaap_TreasuryStockValueAcquiredCostMethodus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse200000200000falsefalsefalse4truefalsefalse300000300000falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse4100000041000000falsefalsefalse8falsefalsefalse00falsefalsefalse9truefalsefalse5200000052000000falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryEquity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 false2Treasury stock repurchased, cost12false 4us-gaap_TreasuryStockAcquiredAverageCostPerShareus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse30.0330.03USD$falsetruefalse4truefalsefalse37.2837.28USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7truefalsefalse36.5936.59USD$falsetruefalse8falsefalsefalse00falsefalsefalse9truefalsefalse34.8934.89USD$falsetruefalse10falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalTotal cost of shares repurchased divided by the total number of shares repurchased.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 false3Average price per share of treasury stock repurchased (in dollars per share)13false 4mw_CommonStockRepurchasesDuringPeriodSharesmw_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse36922143692214falsefalsefalse2truefalsefalse11285251128525falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesThe number of shares of common stock repurchased during the period, regardless of whether the shares are retired, held in treasury or remain outstanding as a forward contract under an accelerated share repurchase agreement.No definition available.false1Shares repurchased14false 4mw_CommonStockRepurchasesDuringPeriodValuemw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse152129000152129000falsefalsefalse2truefalsefalse4129600041296000falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryEquity impact of the value of common stock that has been repurchased during the period, regardless of whether the shares are retired, held in treasury or remain outstanding as a forward contract under an accelerated share repurchase agreement.No definition available.false2Total costs15false 4mw_CommonStockRepurchasesDuringPeriodAveragePricemw_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse37.1437.14USD$falsetruefalse2truefalsefalse36.5936.59USD$falsetruefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalThe average price per share of common stock repurchased during the period, regardless of whether the shares are retired, held in treasury or remain outstanding as a forward contract under an accelerated share repurchase agreement.No definition available.false3Average price per share (in dollars per share)16false 4us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissuedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse67356735falsefalsefalse2truefalsefalse62956295falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesNumber of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. 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