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Defined Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Accounting Standards Update 2017-07 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Reclassifications from operating income to other income | $ 2.3 | $ 9.4

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- Definition Reclassifications from operating income to other Income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |