XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 699.5 | $ 682.4 | $ 678.2 | $ 499.2 | $ 489.4 | $ 494.9 | $ 678.2 | $ 494.9
Net gain in prior service cost |  |  |  | 0.7 |  |  |  | 0.8
Amortization of prior service cost | (1.1) |  |  | (2.2) |  |  | (3.5) | (2.9)
Amortization of net loss | 1.1 |  |  | 1.0 |  |  | 2.9 | 3.1
Other adjustments | 0.1 |  |  |  |  |  |  | 0.2
Balance at the end of the period | 743.7 | 699.5 | 682.4 | 518.6 | 499.2 | 489.4 | 743.7 | 518.6
Pensions |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (48.9) | (49.3) | (40.6) | (40.5) | (41.0) | (41.4) | (40.6) | (41.4)
Reclassification adjustment related to the Tax Act |  |  | (9.2) |  |  |  |  |
Amortization of prior service cost | (0.4) | (0.5) | (0.4) | (0.4) | (0.3) | (0.4) |  |
Amortization of net loss | 0.9 | 0.9 | 0.9 | 0.8 | 0.8 | 0.8 |  |
Balance at the end of the period | (48.4) | (48.9) | (49.3) | (40.1) | (40.5) | (41.0) | (48.4) | (40.1)
Post Retirement |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | 18.1 | 18.4 | 15.6 | 18.5 | 18.2 | 18.1 | 15.6 | 18.1
Reclassification adjustment related to the Tax Act |  |  | 3.4 |  |  |  |  |
Net gain in prior service cost |  |  |  | 0.7 |  |  |  |
Amortization of prior service cost | (0.7) | (0.5) | (0.9) | (1.7) |  |  |  |
Amortization of net loss | 0.3 | 0.2 | 0.3 | 0.2 | 0.3 | 0.1 |  |
Balance at the end of the period | 17.7 | 18.1 | 18.4 | 17.7 | 18.5 | 18.2 | 17.7 | 17.7
Non-Qualified Plans |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (0.4) | (0.4) | (0.3) | (0.3) | (0.4) | (0.4) | (0.3) | (0.4)
Reclassification adjustment related to the Tax Act |  |  | (0.2) |  |  |  |  |
Amortization of prior service cost |  | (0.1) |  | (0.1) |  |  |  |
Amortization of net loss | (0.1) | 0.1 | 0.1 |  | 0.1 |  |  |
Balance at the end of the period | (0.5) | (0.4) | (0.4) | (0.4) | (0.3) | (0.4) | (0.5) | (0.4)
Other |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (0.4) | 0.6 | 0.4 | 0.4 | 0.3 | 0.1 | 0.4 | 0.1
Net gain in prior service cost |  |  |  |  | 0.1 |  |  |
Amortization of net loss |  | (0.7) |  |  |  |  |  |
Other adjustments | 0.1 | (0.3) | 0.2 |  |  | 0.2 |  |
Balance at the end of the period | (0.3) | (0.4) | 0.6 | 0.4 | 0.4 | 0.3 | (0.3) | 0.4
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (31.6) | (30.7) | (24.9) | (21.9) | (22.9) | (23.6) | (24.9) | (23.6)
Reclassification adjustment related to the Tax Act |  |  | (6.0) |  |  |  |  |
Net gain in prior service cost |  |  |  | 0.7 | 0.1 |  |  |
Amortization of prior service cost | (1.1) | (1.1) | (1.3) | (2.2) | (0.3) | (0.4) |  |
Amortization of net loss | 1.1 | 0.5 | 1.3 | 1.0 | 1.2 | 0.9 |  |
Other adjustments | 0.1 | (0.3) | 0.2 |  |  | 0.2 |  |
Balance at the end of the period | $ (31.5) | $ (31.6) | $ (30.7) | $ (22.4) | $ (21.9) | $ (22.9) | $ (31.5) | $ (22.4)

X
- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
Name: | matx_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AOCIAttributableToParentNetOfTaxRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other. + References No definition available. + Details
Name: | us-gaap_OtherComprehensiveIncomeOtherNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=matx_AccumulatedDefinedBenefitPostRetirementPlansAdjustmentAttributableToParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=matx_AccumulatedNonQualifiedPlansAdjustmentAttributableToParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=matx_AccumulatedOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |