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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2017
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | A. O. SMITH CORPORATION SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Dollars in millions) Years ended December 31, 2017, 2016 and 2015
Description |  | Balance at Beginning of Year |  |  | Charged to Costs and Expenses |  |  | Acquisition of Businesses |  |  | Deductions |  |  | Balance at End of Year |
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance for trade and notes receivable |  | $ | 6.3 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | (1.2 | ) |  | $ | 5.3 |
Valuation allowance for deferred tax assets |  |  | 13.1 |  |  |  | 1.9 |  |  |  | — |  |  |  | — |  |  |  | 15.0 |
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance for trade and notes receivable |  | $ | 6.0 |  |  | $ | 1.1 |  |  | $ | 0.2 |  |  | $ | (1.0 | ) |  | $ | 6.3 |
Valuation allowance for deferred tax assets |  |  | 11.0 |  |  |  | 2.1 |  |  |  | — |  |  |  | — |  |  |  | 13.1 |
2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance for trade and notes receivable |  | $ | 3.7 |  |  | $ | 2.6 |  |  |  | — |  |  | $ | (0.3 | ) |  | $ | 6.0 |
Valuation allowance for deferred tax assets |  |  | 9.8 |  |  |  | 1.4 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 11.0 |

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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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Namespace Prefix: | us-gaap_
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