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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |  |
Percentage of total inventories on LIFO | 72.00% | 72.00% | 71.00%
Excess of FIFO over LIFO | $ 339.8 | $ 377.1 | $ 288.2
Reserve for obsolescence | $ 115.4 | $ 105.9 | $ 103.7

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- Definition Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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