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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Beginning balance | $ 4,736.8 | $ 4,395.9 |
Goodwill of acquired businesses | 1,994.5 | 350.0 | $ 648.1
Goodwill disposed of relating to sales of businesses | (46.2) | (3.1) |
Foreign currency translation adjustments during the year | (10.9) | (6.0) |
Ending balance | 6,674.2 | 4,736.8 | 4,395.9
Retail |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 2,987.2 | 2,650.4 |
Goodwill of acquired businesses | 1,366.6 | 346.0 | 300.0
Goodwill disposed of relating to sales of businesses | (38.5) | (3.1) |
Foreign currency translation adjustments during the year | (6.3) | (6.1) |
Ending balance | 4,309.0 | 2,987.2 | 2,650.4
National Programs |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 1,089.9 | 1,091.1 |
Goodwill of acquired businesses | 516.5 | (1.3) | 163.1
Goodwill disposed of relating to sales of businesses | 0.0 | 0.0 |
Foreign currency translation adjustments during the year | (4.0) | 0.1 |
Ending balance | 1,602.4 | 1,089.9 | 1,091.1
Wholesale Brokerage |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 488.4 | 483.1 |
Goodwill of acquired businesses | 111.4 | 5.3 | 185.0
Goodwill disposed of relating to sales of businesses | (7.7) | 0.0 |
Foreign currency translation adjustments during the year | (0.6) | 0.0 |
Ending balance | 591.5 | 488.4 | 483.1
Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 171.3 | 171.3 |
Goodwill of acquired businesses | 0.0 | 0.0 | 0.1
Goodwill disposed of relating to sales of businesses | 0.0 | 0.0 |
Foreign currency translation adjustments during the year | 0.0 | 0.0 |
Ending balance | $ 171.3 | $ 171.3 | $ 171.3

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 55 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 55 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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