| | | | | UMWA plans | | Black lung and other plans | | Total | |
| | (In millions) | | 2012 | | 2011 | | 2012 | | 2011 | | 2012 | | 2011 | |
| | | | | | | | | | | | | | | | |
| | Three months ended September 30, | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | |
| | Service cost | $ | - | | - | | 0.2 | | - | | 0.2 | | - | |
| | Interest cost on accumulated postretirement benefit obligations | | 5.6 | | 5.9 | | 0.7 | | 0.7 | | 6.3 | | 6.6 | |
| | Return on assets – expected | | (5.3) | | (6.4) | | - | | - | | (5.3) | | (6.4) | |
| | Amortization of losses | | 5.1 | | 3.8 | | 0.4 | | 0.1 | | 5.5 | | 3.9 | |
| | Amortization of prior service cost | | - | | - | | 0.5 | | 0.5 | | 0.5 | | 0.5 | |
| | Net periodic pension cost | $ | 5.4 | | 3.3 | | 1.8 | | 1.3 | | 7.2 | | 4.6 | |
| | | | | | | | | | | | | | | | |
| | Nine months ended September 30, | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | |
| | Service cost | $ | - | | - | | 0.3 | | - | | 0.3 | | - | |
| | Interest cost on accumulated postretirement benefit obligations | | 16.8 | | 17.9 | | 2.2 | | 2.1 | | 19.0 | | 20.0 | |
| | Return on assets – expected | | (15.9) | | (19.2) | | - | | - | | (15.9) | | (19.2) | |
| | Amortization of losses | | 15.6 | | 11.3 | | 1.0 | | 0.3 | | 16.6 | | 11.6 | |
| | Amortization of prior service cost | | - | | - | | 1.5 | | 1.5 | | 1.5 | | 1.5 | |
| | Net periodic pension cost | $ | 16.5 | | 10.0 | | 5.0 | | 3.9 | | 21.5 | | 13.9 | |