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Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers | Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions):
|  | December 31, 2019 |  |  | December 31, 2018 |
Unbilled receivables |  | $ | 556.4 |  |  | $ | 496.2 |
Deferred contract costs |  |  | 98.3 |  |  |  | 91.6 |
Deferred revenue |  |  | 503.8 |  |  |  | 457.7 |
Summary of Changes in Deferred Revenue Balances | Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Total |
Deferred revenue at December 31, 2017 |  | $ | 258.7 |  |  | $ | 171.9 |  |  | $ | 430.6 |
Incremental deferred revenue |  |  | 244.0 |  |  |  | 138.1 |  |  |  | 382.1 |
Revenue recognized during the year ended December 31, 2018 included in deferred revenue at December 31, 2017 |  |  | (236.5 | ) |  |  | (137.0 | ) |  |  | (373.5 | )
Deferred revenue recognized from business acquisitions |  |  | 18.5 |  |  |  | — |  |  |  | 18.5 |
Deferred revenue at December 31, 2018 |  |  | 284.7 |  |  |  | 173.0 |  |  |  | 457.7 |
Incremental deferred revenue |  |  | 276.2 |  |  |  | 136.9 |  |  |  | 413.1 |
Revenue recognized during the year ended December 31, 2019 included in deferred revenue at December 31, 2018 |  |  | (254.3 | ) |  |  | (143.3 | ) |  |  | (397.6 | )
Deferred revenue recognized from business acquisitions |  |  | 30.6 |  |  |  | — |  |  |  | 30.6 |
Deferred revenue at December 31, 2019 |  | $ | 337.2 |  |  | $ | 166.6 |  |  | $ | 503.8 |
Summary of Expected Revenue Related to Performance Obligations | The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions):
|  | Brokerage |  |  | Risk Management |  |  | Total |
2020 |  | $ | 309.6 |  |  | $ | 93.2 |  |  | $ | 402.8 |
2021 |  |  | 23.6 |  |  |  | 33.8 |  |  |  | 57.4 |
2022 |  |  | 1.8 |  |  |  | 15.7 |  |  |  | 17.5 |
2023 |  |  | 1.1 |  |  |  | 8.5 |  |  |  | 9.6 |
2024 |  |  | 0.5 |  |  |  | 4.9 |  |  |  | 5.4 |
Thereafter |  |  | 0.6 |  |  |  | 10.5 |  |  |  | 11.1 |
Total |  | $ | 337.2 |  |  | $ | 166.6 |  |  | $ | 503.8 |

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- Definition Contract with customer, liability + References No definition available. + Details
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Namespace Prefix: | ajg_
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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
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