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Schedule II. Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 12.8 |  |  | $ | 5.4 |  |  | $ | (4.7 | ) (1) |  | $ | 13.5 |
Allowance for estimated policy cancellations |  |  | 7.1 |  |  |  | 2.1 |  |  |  | (1.8 | ) (2) |  |  | 7.4 |
Valuation allowance for deferred tax assets |  |  | 66.8 |  |  |  | 12.3 |  |  |  | — |  |  |  | 79.1 |
Accumulated amortization of expiration lists, noncompete agreements and trade names |  |  | 1,203.6 |  |  |  | 264.7 |  |  |  | 22.4 | (3) |  |  | 1,490.7 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 13.3 |  |  | $ | 4.9 |  |  | $ | (5.4 | ) (1) |  | $ | 12.8 |
Allowance for estimated policy cancellations |  |  | 7.4 |  |  |  | 0.2 |  |  |  | (0.5 | ) (2) |  |  | 7.1 |
Valuation allowance for deferred tax assets |  |  | 52.8 |  |  |  | 14.0 |  |  |  | — |  |  |  | 66.8 |
Accumulated amortization of expiration lists, noncompete agreements and trade names |  |  | 983.9 |  |  |  | 247.2 |  |  |  | (27.5 | ) (3) |  |  | 1,203.6 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 10.7 |  |  | $ | 5.7 |  |  | $ | (3.1 | ) (1) |  | $ | 13.3 |
Allowance for estimated policy cancellations |  |  | 6.8 |  |  |  | 3.6 |  |  |  | (3.0 | ) (2) |  |  | 7.4 |
Valuation allowance for deferred tax assets |  |  | 73.7 |  |  |  | (20.9 | ) |  |  | — |  |  |  | 52.8 |
Accumulated amortization of expiration lists, noncompete agreements and trade names |  |  | 758.8 |  |  |  | 240.3 |  |  |  | (15.2 | ) (3) |  |  | 983.9 |
(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 any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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