|
Goderich Tornado (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 32 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2014
|
Mar. 31, 2013
|
Mar. 31, 2014
|
Dec. 31, 2013
|
|
| Goderich Tornado [Abstract] | ||||
| Total insurance advances | $ 13.7 | $ 7.5 | $ 100.0 | |
| Total insurance advances received and recorded as reduction to salt product costs | 0.8 | |||
| Deferred revenue | 13.7 | 6.7 | ||
| Total amount recorded in deferred revenue since the tornado | $ 68.0 | $ 68.0 | $ 56.5 | |