XML 76 R51.htm IDEA: XBRL DOCUMENT
v3.8.0.1

ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017
Goodwill and Other Intangible Assets |
Assumed annual growth rate of cash flows (as a percent) | 2.00%
Period of operation forecasts used in impairment test | 5 years
Weighted average cost of capital (as a percent) | 8.00%
Minimum |
Goodwill and Other Intangible Assets |
Discount rate on estimated discounted cash flows (as a percent) | 10.00%
Maximum |
Goodwill and Other Intangible Assets |
Discount rate on estimated discounted cash flows (as a percent) | 13.00%

X
- Definition Assumed Annual Growth Rate Of Cash Flows + References No definition available. + Details
Name: | mas_AssumedAnnualGrowthRateOfCashFlows
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of the operation forecasts used in impairment test. + References No definition available. + Details
Name: | mas_PeriodOfOperationForecastsUsedInImpairmentTest
Namespace Prefix: | mas_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the entity's weighted average cost of capital. + References No definition available. + Details
Name: | mas_WeightedAverageCostOfCapital
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |