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Pension and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash contributions, pension plans	$ 67.7	$ 71.2		$ 138.4
Cash contributions, postretirement benefits	72.9	76.2	[1]
Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	147.3
Pension Plans | U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	86.3
Pension Plans | Non-U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	61.0
Postretirement Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company	12.0			$ 12.2
Cash contributions, postretirement benefits	$ 5.2	$ 5.0
[1] Amounts were changed to conform to the current-year presentation. See Note 3.

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- Definition

Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920

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- Definition

Amount of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
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Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

+ References

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
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