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SCHEDULE II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2021
Valuation And Qualifying Accounts [Abstract] |
SCHEDULE II - Valuation and Qualifying Accounts | SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS MARTIN MARIETTA MATERIALS, INC. AND CONSOLIDATED SUBSIDIARIES
Col A |  | Col B |  |  | Col C |  |  |  | Col D |  |  |  | Col E |
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |  |  |
Description |  | Balance at beginning of period |  |  | (1) Charged to costs and expenses |  |  | (2) Charged to other accounts- describe |  |  |  | Deductions- describe |  |  |  | Balance at end of period |
|  | (Amounts in Millions) |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for estimated credit losses |  | $ | 5.9 |  |  | $ | — |  |  | $ | — |  |  |  | $ | 0.1 |  | (a) |  | $ | 5.8 |
Allowance for estimated credit losses on notes receivable |  |  | 0.4 |  |  |  | — |  |  |  | — |  |  |  |  | 0.3 |  | (a) |  |  | 0.1 |
Inventory valuation allowance |  |  | 180.3 |  |  |  | 65.2 |  |  |  | 9.6 |  | (b) |  |  | 40.8 |  | (c) |  |  | 214.3 |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for estimated credit losses |  | $ | 4.7 |  |  | $ | 1.2 |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 5.9 |
Allowance for estimated credit losses on notes receivable |  |  | — |  |  |  | 0.4 |  |  |  | — |  |  |  |  | — |  |  |  |  | 0.4 |
Inventory valuation allowance |  |  | 168.6 |  |  |  | 51.3 |  |  |  | — |  |  |  |  | 39.6 |  | (c) |  |  | 180.3 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 3.3 |  |  | $ | 1.4 |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | 4.7 |
Allowance for uncollectible notes receivable |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Inventory valuation allowance |  |  | 159.2 |  |  |  | 38.8 |  |  |  | — |  |  |  |  | 29.4 |  | (c) |  |  | 168.6 |
(a) | Change in estimates
(b) | Application of reserve policy to acquired inventories/customer receivables
(c) | Sale of reserved inventory and divestitures

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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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