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Goodwill - Summary of Goodwill (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Goodwill [Line Items] |
Gross cost, beginning balance | $ 599.5
Accumulated impairment losses, beginning balance | (236.5)
Net book amount, beginning balance | 363.0
Exchange effect | (1.8)
Exchange effect | 0.0
Gross cost, ending balance | 597.7
Accumulated impairment losses, ending balance | (236.5)
Net book amount, ending balance | $ 361.2

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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