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Acquisitions - Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Opening balance	$ 22.8	$ 28.0	$ 24.4	$ 39.8
Acquisitions	3.6	2.7	3.6	4.7
Payments and issuances	(4.0)	(0.4)	(6.0)	(11.0)
Fair value (gains) losses included in net loss	(0.7)	2.7	(0.3)	(0.5)
Closing balance	$ 21.7	$ 33.0	$ 21.7	$ 33.0

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- Definition

Business combination contingent consideration acquisitions during the period.

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Payment of contingent consideration in cash and issuance of shares.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e7008-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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