|
Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | $ 1,332.7 | $ 1,287.0 |
| Less accumulated depreciation and depletion | (641.4) | (609.7) |
| Total property, plant and equipment, net | 691.3 | 677.3 |
|
Land, Buildings and Structures and Leasehold Improvements [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 346.1 | 347.1 |
|
Machinery and Equipment [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 677.4 | 668.0 |
|
Office Furniture and Equipment [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 23.3 | 21.5 |
|
Mineral Interests [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | 182.2 | 180.9 |
|
Construction in Progress [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Property, plant and equipment, gross | $ 103.7 | $ 69.5 |