Defined Contribution and Defined Benefit Retirement - Schedule of Plans for which Accumulated Benefit Obligations Exceeds Plan Assets (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S.
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	$ 63.2	$ 60.6
Accumulated benefit obligations	63.2	60.6
Fair value of plan assets	53.3	48.4
Non U.S.
Plans for which the ABO exceeds plan assets:
Projected benefit obligations	800.2	685.4
Accumulated benefit obligations	777.4	663.3
Fair value of plan assets	$ 430.8	$ 381.7

Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920

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