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PENSION PLANS | 3 Months Ended
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Apr. 03, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
PENSION PLANS | PENSION PLANS The components of net periodic pension cost consist of:
|  |  | Three Months Ended
|  |  | April 3, 2016 |  | March 29, 2015
|  |  | (in millions)
Service cost |  |  | $ | 12.8 |  |  | $ | 15.1 |
Interest cost |  |  | 20.4 |  |  | 19.0 |
Expected return on plan assets |  |  | (24.7 | ) |  | (22.1 | )
Net amortization |  |  | 2.3 |  |  | 1.2 |
Net periodic pension cost |  |  | $ | 10.8 |  |  | $ | 13.2 |
In January 2016, we made a $125.0 million voluntary contribution to fund our qualified pension plans.

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