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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefit Plans | Pension Benefits The components of net periodic cost (benefit) are as follows:
| Three Months Ended
| March 31,
(in millions) | 2017 |  | 2016
Service cost | $ | 1.2 |  |  | $ | 1.2 |
Interest cost | 7.2 |  |  | 8.2 |
Expected return on plan assets | (13.9 | ) |  | (14.5 | )
Amortization of prior service cost | (0.1 | ) |  | (0.2 | )
Amortization of net loss | 3.5 |  |  | 2.9 |
Net periodic benefit | $ | (2.1 | ) |  | $ | (2.4 | )
The Company expects, based on current actuarial calculations, to contribute approximately $12.0 million to its defined benefit plans, of which $1.8 million has been contributed during the first three months of 2017. The Company contributed $8.3 million to its defined benefit plans in 2016. 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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