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Defined Contribution and Defined Benefit Retirement - Schedule of Aggregate Fair Value of Asset and Supplemental Asset Mix (Detail) $ in Millions | Dec. 31, 2017 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
CMRT asset value | $ 672.4
CMRT asset mix | 100.00%
Total CMRT assets | 100.00%
Level 1 |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 54.00%
Level 2 |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 8.00%
Level 3 |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 7.00%
Assets Not Subject to Fair Value Hierarchy |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 31.00%
Domestic Equities, Principally Publicly Traded |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 33.00%
International Equities, Principally Publicly Traded |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 25.00%
Fixed Income Securities, Principally Publicly Traded |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 31.00%
Privately Managed Limited Partnerships |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 4.00%
Hedge Funds |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 5.00%
Other, Primarily Cash |
Defined Benefit Plan Disclosure [Line Items] |
CMRT asset mix | 2.00%

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- 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
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- Definition Fair value of CMRT plan assets attributable to the defined benefit pension plans to which two or more participating affiliates contribute. + References No definition available. + Details
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- Definition Actual allocation percentage of CMRT plan assets according to the asset category (domestic equities, international equities, fixed income securities, privately managed limited partnerships, other). + References No definition available. + Details
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