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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5901957930F7AD52431B144FB27A6AE2_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5901957930F7AD52431B144FB27A6AE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5901957930F7AD52431B144FB27A6AE2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5901957930F7AD52431B144FB27A6AE2" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5901957930F7AD52431B144FB27A6AE2" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_D48991363DAD5A0E8D5B144FB27AB0CF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Amortization Expense, after Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_6E3516F8A7AD8A870136144FB27A1D02" xlink:type="arc" />
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    <link:label id="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_B3F1F3FDD8DA845AC0F3EFFDA2CF3CE4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_B3F1F3FDD8DA845AC0F3EFFDA2CF3CE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Defined Benefit Plans Disclosures [Table]</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_EA526CD64C5366882636EFFDA2CF8C86_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_EA526CD64C5366882636EFFDA2CF8C86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_EA526CD64C5366882636EFFDA2CF8C86" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlansDomain_09AC491EB5B535C6B5C8EFFDA2CF9A30_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlansDomain_09AC491EB5B535C6B5C8EFFDA2CF9A30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_09AC491EB5B535C6B5C8EFFDA2CF9A30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_09AC491EB5B535C6B5C8EFFDA2CF9A30" xlink:to="lab_us-gaap_DefinedBenefitPlansDomain_09AC491EB5B535C6B5C8EFFDA2CF9A30" xlink:type="arc" />
    <link:label id="lab_us-gaap_PensionPlansDefinedBenefitMember_D0EF438416CA338DA43DEFFDA2CF4992_terseLabel_en-US" xlink:label="lab_us-gaap_PensionPlansDefinedBenefitMember_D0EF438416CA338DA43DEFFDA2CF4992" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Pension</link:label>
    <link:label id="lab_us-gaap_PensionPlansDefinedBenefitMember_D0EF438416CA338DA43DEFFDA2CF4992_label_en-US" xlink:label="lab_us-gaap_PensionPlansDefinedBenefitMember_D0EF438416CA338DA43DEFFDA2CF4992" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension Plan, Defined Benefit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_D0EF438416CA338DA43DEFFDA2CF4992" xlink:type="locator" />
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    <link:label id="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755_terseLabel_en-US" xlink:label="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Qualified Pension Plan</link:label>
    <link:label id="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755_label_en-US" xlink:label="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Qualified Pension Plan [Member]</link:label>
    <link:label id="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755_documentation_en-US" xlink:label="lab_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the qualified pension plan</link:label>
    <link:loc xlink:href="dxm-20130930.xsd#dxm_QualifiedPensionPlanMember" xlink:label="loc_dxm_QualifiedPensionPlanMember_3F590DCDE075F83AEAB3EFFDA2CF0755" xlink:type="locator" />
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    <link:label id="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4_terseLabel_en-US" xlink:label="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non Qualified Pension Plan</link:label>
    <link:label id="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4_label_en-US" xlink:label="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non Qualified Pension Plan [Member]</link:label>
    <link:label id="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4_documentation_en-US" xlink:label="lab_dxm_NonQualifiedPensionPlanMember_DCC93F5989670D0C189CEFFDA2CFE4B4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the non-qualified pension</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_F784C36B35C7F399BE92EFFDA2CF3E60" xlink:type="locator" />
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    <link:label id="lab_dxm_NumberOfPensionPlans_5248398BAE3A6834BEB1EFFDA2CFD0C9_terseLabel_en-US" xlink:label="lab_dxm_NumberOfPensionPlans_5248398BAE3A6834BEB1EFFDA2CFD0C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of pension plans</link:label>
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    <link:label id="lab_dxm_NumberOfPensionPlans_5248398BAE3A6834BEB1EFFDA2CFD0C9_documentation_en-US" xlink:label="lab_dxm_NumberOfPensionPlans_5248398BAE3A6834BEB1EFFDA2CFD0C9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of pension plans provided by the entity to its employees.</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_AE5C9B618F87D8752BAAEFFDA2CFFFC4_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_AE5C9B618F87D8752BAAEFFDA2CFFFC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of net periodic cost (income)</link:label>
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    <link:label id="lab_dxm_ProvisionForUnrecognizedTaxBenefits_10BE5E0A8CCC0A61EEA0142C5AE87B43_label_en-US" xlink:label="lab_dxm_ProvisionForUnrecognizedTaxBenefits_10BE5E0A8CCC0A61EEA0142C5AE87B43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Provision For Unrecognized Tax Benefits</link:label>
    <link:label id="lab_dxm_ProvisionForUnrecognizedTaxBenefits_10BE5E0A8CCC0A61EEA0142C5AE87B43_documentation_en-US" xlink:label="lab_dxm_ProvisionForUnrecognizedTaxBenefits_10BE5E0A8CCC0A61EEA0142C5AE87B43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Provision For Unrecognized Tax Benefits</link:label>
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    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_F7A204AC8DC99C06C6CA142C573FACA7_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_F7A204AC8DC99C06C6CA142C573FACA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for bad debts</link:label>
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    <link:label id="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A_terseLabel_en-US" xlink:label="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-cash interest expense</link:label>
    <link:label id="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A_label_en-US" xlink:label="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Non-cash Interest Expense</link:label>
    <link:label id="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A_documentation_en-US" xlink:label="lab_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Non-cash Interest Expense</link:label>
    <link:loc xlink:href="dxm-20130930.xsd#dxm_OtherNoncashInterestExpense" xlink:label="loc_dxm_OtherNoncashInterestExpense_F09D41BC3A622666703E142C5740D50A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensation_7E3E580DFA6B548A8915142C5740DB5F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_7E3E580DFA6B548A8915142C5740DB5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_7E3E580DFA6B548A8915142C5740DB5F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_7E3E580DFA6B548A8915142C5740DB5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
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    <link:label id="lab_us-gaap_PensionAndOtherPostretirementBenefitExpense_6F88B8ECC0AF5BD9A2B7142C57407DA6_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementBenefitExpense_6F88B8ECC0AF5BD9A2B7142C57407DA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee retiree benefits</link:label>
    <link:label id="lab_us-gaap_PensionAndOtherPostretirementBenefitExpense_6F88B8ECC0AF5BD9A2B7142C57407DA6_label_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementBenefitExpense_6F88B8ECC0AF5BD9A2B7142C57407DA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pension and Other Postretirement Benefit Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitExpense_6F88B8ECC0AF5BD9A2B7142C57407DA6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AAAECC3FF841C9E0D0A015A4CB56271A_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AAAECC3FF841C9E0D0A015A4CB56271A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Settlement losses</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentBeforeTax_B448829900DBA556C58915A4CB56D580_terseLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentBeforeTax_B448829900DBA556C58915A4CB56D580" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total reclassifications included in net (loss)</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentBeforeTax_B448829900DBA556C58915A4CB56D580_documentation_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentBeforeTax_B448829900DBA556C58915A4CB56D580" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the before tax amount of reclassification adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) included in net income related to pension and other postretirement benefit plans.</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentTaxAbstract_1821F35932E8437ED28115A4CB56F84A_terseLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentTaxAbstract_1821F35932E8437ED28115A4CB56F84A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassifications included in net income (loss): Taxes</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTaxAbstract_DDE7A3A1AB7BCB4C807B15A4CB58B14D_terseLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTaxAbstract_DDE7A3A1AB7BCB4C807B15A4CB58B14D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reclassifications included in net income (loss): Net</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_A0F6B7D6E889FB477ABF15A4CB580BE4_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_A0F6B7D6E889FB477ABF15A4CB580BE4" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Accumulated actuarial losses of benefit plans</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_668B24A64ACFAA340F2615A4CB584619_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_668B24A64ACFAA340F2615A4CB584619" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Amortization of actuarial losses</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_668B24A64ACFAA340F2615A4CB584619" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_668B24A64ACFAA340F2615A4CB584619" xlink:type="arc" />
    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansSettlementAdjustmentNetOfTax_0838682A8D41201A7CDA15A4CB588283_totalLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansSettlementAdjustmentNetOfTax_0838682A8D41201A7CDA15A4CB588283" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Settlement losses</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansSettlementAdjustmentNetOfTax_0838682A8D41201A7CDA15A4CB588283_documentation_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansSettlementAdjustmentNetOfTax_0838682A8D41201A7CDA15A4CB588283" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the net of tax amount of settlement adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans included in net income.</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax_190B1E1FA214E796BD0D15A4CB58AD43_negatedTotalLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax_190B1E1FA214E796BD0D15A4CB58AD43" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Total reclassifications included in net income (loss)</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax_190B1E1FA214E796BD0D15A4CB58AD43_documentation_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax_190B1E1FA214E796BD0D15A4CB58AD43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the net of tax amount of reclassification adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) included in net income related to pension and other postretirement benefit plans.</link:label>
    <link:loc xlink:href="dxm-20130930.xsd#dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax" xlink:label="loc_dxm_OtherComprehensiveIncomeDefinedBenefitPlansReclassificationsAdjustmentNetOfTax_190B1E1FA214E796BD0D15A4CB58AD43" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ECC62F9C6B92E812102315A4CB584673_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ECC62F9C6B92E812102315A4CB584673" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US">Adjustments for pension and other post-employment benefits</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ECC62F9C6B92E812102315A4CB584673" xlink:to="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_ECC62F9C6B92E812102315A4CB584673" xlink:type="arc" />
    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansAmortizationOfNetPriorServiceCostAndUnrecognizedNetGainLossNetOfTax_BE402329066CE2CAAE1215A4CB58D10D_totalLabel_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansAmortizationOfNetPriorServiceCostAndUnrecognizedNetGainLossNetOfTax_BE402329066CE2CAAE1215A4CB58D10D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total comprehensive income (loss)</link:label>
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    <link:label id="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansAmortizationOfNetPriorServiceCostAndUnrecognizedNetGainLossNetOfTax_BE402329066CE2CAAE1215A4CB58D10D_documentation_en-US" xlink:label="lab_dxm_OtherComprehensiveIncomeDefinedBenefitPlansAmortizationOfNetPriorServiceCostAndUnrecognizedNetGainLossNetOfTax_BE402329066CE2CAAE1215A4CB58D10D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net of tax amount of the income statement impact of the amortization adjustment for prior service costs and unrecognized net gain (loss) recognized as a component of net periodic benefit cost.</link:label>
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    <link:label id="lab_dxm_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxRollForward_695FDD20DEC76B7595F815A4CB589419_terseLabel_en-US" xlink:label="lab_dxm_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxRollForward_695FDD20DEC76B7595F815A4CB589419" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in accumulated other comprehensive income, Gross</link:label>
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    <link:label id="lab_dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentsExcessCashFlowSweepPercentage_A67AC3FA135783EEDCFC294404BF1AA0_terseLabel_en-US" xlink:label="lab_dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentsExcessCashFlowSweepPercentage_A67AC3FA135783EEDCFC294404BF1AA0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mandatory debt principal payments, excess cash flow sweep percentage</link:label>
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    <link:loc xlink:href="dxm-20130930.xsd#dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentsExcessCashFlowSweepPercentage" xlink:label="loc_dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentsExcessCashFlowSweepPercentage_A67AC3FA135783EEDCFC294404BF1AA0" xlink:type="locator" />
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    <link:label id="lab_dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentDueAsPercentageOfIncreaseInAvailableCash_9FF08DDA26368B8F04A3294404BF5CD0_terseLabel_en-US" xlink:label="lab_dxm_DebtInstrumentCovenantMandatoryDebtPrincipalPaymentDueAsPercentageOfIncreaseInAvailableCash_9FF08DDA26368B8F04A3294404BF5CD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mandatory debt principal payment due as percentage of increase in available cash</link:label>
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    <link:label id="lab_dxm_DebtInstrumentCovenantRepurchaseDebtFaceValueDiscountPercent_8FDA4061657BF1141754294404BFC4AA_terseLabel_en-US" xlink:label="lab_dxm_DebtInstrumentCovenantRepurchaseDebtFaceValueDiscountPercent_8FDA4061657BF1141754294404BFC4AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase debt, face value discount percent</link:label>
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    <link:label id="lab_dxm_DebtInstrumentCovenantRepurchaseDebtMaximumPeriodtoRepurchaseDebt_8BF05CF0D433BFD6897B294404BFAFC2_terseLabel_en-US" xlink:label="lab_dxm_DebtInstrumentCovenantRepurchaseDebtMaximumPeriodtoRepurchaseDebt_8BF05CF0D433BFD6897B294404BFAFC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Repurchase debt, maximum period to repurchase debt</link:label>
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