|
Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Dec. 31, 2013
|
|
| Cote Blanche [Member] | ||
| Loss Contingencies [Line Items] | ||
| Reserve for expected payments required to resolve the dispute | $ 5 | |
| Additional amount of reserve for expected payments required to resolve the dispute | 2 | |
| Goderich Mine [Member] | ||
| Loss Contingencies [Line Items] | ||
| Claims asserted against the Company | 13 | |
| Cash payment to settle | 4.2 | |
| Gain on payment to settle | $ 0.7 |