Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | $ 1,888.9 | $ 1,846.7 |
| Less: accumulated depreciation and depletion | (1,055.1) | (995.0) |
| Property, plant and equipment, net | 833.8 | 851.7 |
| Land, buildings and structures, and leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | 540.1 | 544.5 |
| Machinery and equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | 1,076.1 | 1,035.4 |
| Office furniture and equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | 55.1 | 50.7 |
| Mineral interests | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | 174.0 | 172.4 |
| Construction in progress | ||
| Property, Plant and Equipment [Line Items] | ||
| Total property plant and equipment | $ 43.6 | $ 43.7 |