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Schedule II. Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Valuation And Qualifying Accounts [Abstract] |
Schedule II. Valuation and Qualifying Accounts | Schedule II Arthur J. Gallagher & Co. Valuation and Qualifying Accounts
|  | Balance at Beginning of Year |  |  | Amounts Recorded in Earnings |  |  | Adjustments |  |  | Balance at End of Year |
|  | (In millions) |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 8.7 |  |  | $ | 6.6 |  |  | $ | (5.2 | ) | (1) | $ | 10.1 |
Allowance for estimated policy cancellations |  |  | 8.3 |  |  |  | 4.1 |  |  |  | (2.5 | ) | (2) |  | 9.9 |
Valuation allowance for deferred tax assets |  |  | 80.5 |  |  |  | 14.4 |  |  |  | — |  |  |  | 94.9 |
Accumulated amortization of expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
lists, non-compete agreements and trade names |  |  | 2,087.5 |  |  |  | 417.3 |  |  |  | 32.2 |  | (3) |  | 2,537.0 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 10.0 |  |  | $ | 4.2 |  |  | $ | (5.5 | ) | (1) | $ | 8.7 |
Allowance for estimated policy cancellations |  |  | 7.8 |  |  |  | 0.5 |  |  |  | — |  | (2) |  | 8.3 |
Valuation allowance for deferred tax assets |  |  | 67.4 |  |  |  | 13.1 |  |  |  | — |  |  |  | 80.5 |
Accumulated amortization of expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
lists, non-compete agreements and trade names |  |  | 1,750.4 |  |  |  | 334.0 |  |  |  | 3.1 |  | (3) |  | 2,087.5 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 13.5 |  |  | $ | 5.8 |  |  | $ | (9.3 | ) | (1) | $ | 10.0 |
Allowance for estimated policy cancellations |  |  | 7.4 |  |  |  | (1.2 | ) |  |  | 1.6 |  | (2) |  | 7.8 |
Valuation allowance for deferred tax assets |  |  | 79.1 |  |  |  | (11.7 | ) |  |  | — |  |  |  | 67.4 |
Accumulated amortization of expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
lists, non-compete agreements and trade names |  |  | 1,490.7 |  |  |  | 291.2 |  |  |  | (31.5 | ) | (3) |  | 1,750.4 |
(1) | Net activity of bad debt write offs and recoveries and acquired businesses.
(2) | Additions to allowance related to acquired businesses.
(3) | Elimination of fully amortized expiration lists, non-compete agreements and trade names, intangible asset/amortization reclassifications and disposal of acquired businesses.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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