Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | $ 1,525.2 | $ 1,435.3 |
| Less accumulated depreciation and depletion | (660.1) | (634.6) |
| Property, plant and equipment, net | 865.1 | 800.7 |
| Land, Buildings and Structures and Leasehold Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 362.1 | 347.3 |
| Machinery and Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 730.3 | 701.5 |
| Office Furniture and Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 26.2 | 25.4 |
| Mineral Interests [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 172.5 | 169.6 |
| Construction in Progress [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | $ 234.1 | $ 191.5 |