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Pension and Other Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefit Plans | Pension and Other Postretirement Benefit Plans The components of net periodic cost are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | Pension Benefits |  | Other Postretirement Benefits |  | Pension Benefits |  | Other Postretirement Benefits
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 1.4 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.0 |  |  | $ | 3.8 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost | 9.5 |  |  | 10.2 |  |  | 0.1 |  |  | 0.1 |  |  | 28.6 |  |  | 30.7 |  |  | 0.3 |  |  | 0.3 |
Expected return on plan assets | (15.7 | ) |  | (15.7 | ) |  | — |  |  | — |  |  | (46.9 | ) |  | (47.1 | ) |  | — |  |  | — |
Amortization of prior service cost | (0.1 | ) |  | — |  |  | (0.1 | ) |  | (0.1 | ) |  | (0.2 | ) |  | 0.1 |  |  | (0.2 | ) |  | (0.2 | )
Amortization of net loss (gain) | 3.1 |  |  | 1.3 |  |  | — |  |  | — |  |  | 9.3 |  |  | 3.8 |  |  | (0.2 | ) |  | (0.1 | )
Curtailment gain * | (4.4 | ) |  | — |  |  | — |  |  | — |  |  | (4.4 | ) |  | — |  |  | — |  |  | — |
Net periodic cost | $ | (6.2 | ) |  | $ | (2.9 | ) |  | $ | — |  |  | $ | — |  |  | $ | (9.6 | ) |  | $ | (8.8 | ) |  | $ | (0.1 | ) |  | $ | — |
* See additional discussion in Notes 5 and 14. The Company expects, based on current actuarial calculations, to contribute approximately $17.0 million to its defined benefit plans and $1.0 million to its other postretirement benefit plans in 2015, of which $15.2 million and $0.2 million have been contributed during the first nine months of 2015, respectively. The Company contributed $24.5 million to its defined benefit plans and $1.0 million to its other postretirement benefit plans in 2014. Cash contributions for subsequent years will depend on a number of factors, including the impact of the Pension Protection Act signed into law in 2006, changes in minimum funding requirements, long-term interest rates, the investment performance of plan assets and changes in employee census data affecting the Company’s projected benefit obligations.

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