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Retirement Plans | 9 Months Ended
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Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | (10) Retirement Plans The components of the net periodic benefit cost for our plans were as follows:
| Defined Benefit Pension Plans |
| 3 Months Ended |  | 9 Months Ended |
| September 30, |  | September 30, |
| 2011 |  | 2010 |  | 2011 |  | 2010 |
Service cost |  | $ | 2.6 |  |  | $ | 2.2 |  |  | $ | 7.9 |  |  | $ | 6.6 |
Interest cost |  |  | 3.9 |  |  |  | 3.6 |  |  |  | 11.7 |  |  |  | 10.8 |
Expected return on assets |  |  | (3.8 | ) |  |  | (3.4 | ) |  |  | (11.5 | ) |  |  | (10.1 | )
Other |  |  | 0.2 |  |  |  | (0.1 | ) |  |  | 0.4 |  |  |  | (0.4 | )
Total benefit cost |  | $ | 2.9 |  |  | $ | 2.3 |  |  | $ | 8.5 |  |  | $ | 6.9 |
| Retiree Health Care Plan |
| 3 Months Ended |  | 9 Months Ended |
| September 30, |  | September 30, |
| 2011 |  | 2010 |  | 2011 |  | 2010 |
Service cost |  | $ | - |  |  | $ | - |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 1.0 |  |  |  | 1.0 |
Other |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (0.1 | )
Total benefit cost |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 1.1 |  |  | $ | 1.0 |
During the three and nine months ended September 30, 2011, contributions made to our pension plans were $7.3 and $17.0, respectively, and contributions made to our retiree health care plan were $0.5 and $1.4, respectively. During 2011, we expect to make total contributions of approximately $21.0 to our pension plans and to fund our retiree health care payments as incurred.

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