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Business Combinations and Asset Acquisitions - Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Combinations [Abstract]
Opening balance	$ 39.8	$ 16.4	$ 19.6
Acquisitions	5.6	20.0	7.4
Fair value (gains) losses included in net loss	(4.7)	8.9	(9.9)
Payments	(16.3)	(5.5)	(0.7)
Closing Balance	$ 24.4	$ 39.8	$ 16.4

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- Definition

Business combination contingent consideration acquisitions during the period.

+ References

No definition available.

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- Definition

Payment of contingent consideration in cash and issuance of shares.

+ References

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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 http://asc.fasb.org/extlink&oid=123570139&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 http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

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-Topic 805
-SubTopic 30
-Section 25
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