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Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of inventories [Abstract] |  |
In-process precious metals | $ 59.0 | $ 53.6
Ore in stockpiles | 33.4 | 35.4
Parts and supplies | 49.2 | 45.7
Dore, refined precious metals and gold in concentrate | 11.0 | 5.5
Inventories | 152.6 | 140.2
Less: Long-term inventory | (25.7) | (30.0)
Inventory | $ 126.9 | $ 110.2

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