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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventories |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | December 31,
​ | 2019 |  | 2018
​ | (in millions)
LIFO inventories - cost on FIFO method | $ | 1,387.7 | ​ | $ | 1,737.3
Cost on FIFO method higher than LIFO value | ​ | (137.6) | ​ | ​ | (293.6)
Inventories - stated on LIFO method | ​ | 1,250.1 | ​ | ​ | 1,443.7
Inventories - stated on FIFO method | ​ | 395.6 | ​ | ​ | 373.4
​ | $ | 1,645.7 | ​ | $ | 1,817.1
Schedule of changes in the LIFO valuation reserve and impact of LIFO liquidations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2019 | ​ | 2018 | ​ | 2017
​ | (in millions)
LIFO inventory valuation reserve adjustment (income) charge | $ | (156.0) | ​ | $ | 271.8 | ​ | $ | 73.3
Liquidation of LIFO inventory quantities that decreased cost of sales | ​ | (11.6) | ​ | ​ | ** | ​ | ​ | **
** Insignificant liquidations of LIFO inventory quantities. ​

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