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Inventories (Summary Of Inventory) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Finished products - First-In, First-Out ("FIFO") basis | $ 300.0 | $ 223.0
Less: Last-In, First-Out ("LIFO") reserve - finished products | (192.2) | (101.3)
Finished products - LIFO basis | 107.8 | 121.7
Store merchandise for resale | 169.0 | 152.0
Materials and supplies | 6.2 | 5.4
Total inventories | $ 283.0 | $ 279.1

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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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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=120391452&loc=d3e13212-122682 + Details
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