|
Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
$ 1,318.0 |
$ 1,327.3 |
| Less accumulated depreciation and depletion |
(618.4) |
(626.4) |
| Property, plant and equipment, net |
699.6 |
700.9 |
| Land, Buildings and Structures and Leasehold Improvements [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
345.7 |
352.2 |
| Machinery and Equipment [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
664.6 |
669.1 |
| Office Furniture and Equipment [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
17.5 |
17.5 |
| Mineral Interests [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
174.2 |
179.6 |
| Construction in Progress [Member] |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Property, plant and equipment, gross |
$ 116.0 |
$ 108.9 |