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Revenue by Geographic Area (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | [1] | Dec. 31, 2017 | [1]
Schedule Of Geographical Information [Line Items] |  |  |
Total revenues | $ 1,994.8 | $ 1,916.5 | $ 1,854.7
Americas |  |  |
Schedule Of Geographical Information [Line Items] |  |  |
Total revenues | 912.7 | 892.4 | 871.3
Europe Middle East and Africa |  |  |
Schedule Of Geographical Information [Line Items] |  |  |
Total revenues | 849.9 | 809.0 | 765.9
Asia Pacific |  |  |
Schedule Of Geographical Information [Line Items] |  |  |
Total revenues | $ 232.2 | $ 215.1 | $ 217.5
[1] | Starting 2019, Middle East and Africa are part of the “Europe Middle East and Africa” region, while before it was part of “Asia Pacific, Middle East and Africa” region. 2018 and 2017 figures were reclassified to present the updated revenue distribution by geography.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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