| |
Phosphogypsum Stack System Costs |
Mine Reclamation Costs |
Other AROs |
Total | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
(in millions) |
||||||||||||
|
Obligation at December 31, 2010 |
$ | 52.1 | $ | 61.3 | $ | 6.4 | $ | 119.8 | |||||
|
Accretion expense |
3.9 | 5.1 | 0.4 | 9.4 | |||||||||
|
Liabilities incurred |
— | 2.4 | — | 2.4 | |||||||||
|
Expenditures |
(2.8 | ) | (2.7 | ) | (0.5 | ) | (6.0 | ) | |||||
|
Change in estimate |
1.7 | 1.5 | 2.8 | 6.0 | |||||||||
| | | | | | | | | | | | | | |
|
Obligation at December 31, 2011 |
54.9 | 67.6 | 9.1 | 131.6 | |||||||||
|
Accretion expense |
4.1 | 5.3 | 0.4 | 9.8 | |||||||||
|
Liabilities incurred |
12.5 | 0.9 | — | 13.4 | |||||||||
|
Expenditures |
(1.5 | ) | (3.3 | ) | (1.4 | ) | (6.2 | ) | |||||
|
Change in estimate |
0.1 | (3.8 | ) | 0.1 | (3.6 | ) | |||||||
| | | | | | | | | | | | | | |
|
Obligation at December 31, 2012 |
70.1 | 66.7 | 8.2 | 145.0 | |||||||||
|
Accretion expense |
4.7 | 5.2 | 0.4 | 10.3 | |||||||||
|
Liabilities incurred |
— | 2.5 | — | 2.5 | |||||||||
|
Expenditures |
(0.6 | ) | (2.3 | ) | (1.3 | ) | (4.2 | ) | |||||
|
Change in estimate |
4.7 | 9.3 | (1.0 | ) | 13.0 | ||||||||
| | | | | | | | | | | | | | |
|
Obligation at December 31, 2013 |
$ | 78.9 | $ | 81.4 | $ | 6.3 | $ | 166.6 | |||||
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