Obligations and Changes in Funded Status For the year ended December 31, 2018 For the year ended December 31, 2017 Pension OPEB Consolidated Pension OPEB Consolidated (In millions) Change in benefit obligation: Prior year benefit obligation $ 5,584.4 $ 803.6 $ 6,388.0 $ 6,177.5 $ 835.0 $ 7,012.5 Service cost, net of expected employee contributions 4.7 9.3 14.0 7.2 10.9 18.1 Interest cost 161.8 25.8 187.6 205.6 30.6 236.2 Actual employee contributions 0.6 — 0.6 0.7 — 0.7 Actuarial loss (gain) (342.3) (108.8) (451.1) 179.4 (34.9) 144.5 Amendments and special termination benefits 10.7 (3.2 ) 7.5 — (4.4 ) (4.4 ) Benefits paid (296.8) (44.1) (340.9) (327.5) (43.3) (370.8) Settlement (0.6 ) — (0.6 ) (947.6 ) — (947.6 ) Foreign currency exchange rate change (217.8) (10.5) (228.3) 289.1 9.7 298.8 Benefit obligation at end of year $ 4,904.7 $ 672.1 $ 5,576.8 $ 5,584.4 $ 803.6 $ 6,388.0 Change in plan assets: Prior year fair value of assets $ 5,897.7 $ — $ 5,897.7 $ 5,945.5 $ — $ 5,945.5 Actual return on plan assets (156.1) — (156.1) 608.9 — 608.9 Employer contributions 8.9 44.1 53.0 310.0 43.3 353.3 Actual employee contributions 0.6 — 0.6 0.7 — 0.7 Settlement (0.6 ) — (0.6 ) (947.6 ) — (947.6 ) Benefits and plan expenses paid (296.8) (44.1) (340.9) (327.5) (43.3) (370.8) Foreign currency exchange rate change (236.4 ) — (236.4 ) 307.7 — 307.7 Fair value of plan assets at end of year $ 5,217.3 $ — $ 5,217.3 $ 5,897.7 $ — $ 5,897.7 Funded status: $ 312.6 $ (672.1 ) $ (359.5 ) $ 313.3 $ (803.6 ) $ (490.3 ) Amounts recognized in the Consolidated Balance Sheets: Other non-current assets $ 416.7 $ — $ 416.7 $ 412.0 $ — $ 412.0 Accounts payable and other current liabilities (4.5) (45.1) (49.6) (4.9) (48.9) (53.8) Pension and postretirement benefits (99.6 ) (627.0 ) (726.6 ) (93.8 ) (754.7 ) (848.5 ) Net amounts recognized $ 312.6 $ (672.1) $ (359.5) $ 313.3 $ (803.6) $ (490.3) As of December 31, 2018 December 31, 2017 (In millions) Accumulated benefit obligation $ 742.1 $ 864.0 Projected benefit obligation $ 742.4 $ 864.3 Fair value of plan assets $ 638.3 $ 765.6 Information for OPEB plans with an accumulated postretirement benefit obligation in excess of plan assets has been disclosed above in "Obligations and Changes in Funded Status" as all of our OPEB plans are unfunded. 138 As of December 31, 2018, our defined benefit plan in the U.K. and certain defined benefit plans in the U.S. and Canada were overfunded as a result of our ongoing de-risking strategy. Information for our defined benefit plans that had aggregate accumulated benefit obligations and projected benefit obligations in excess of plan assets as of December 31, 2018, is as follows: The accumulated benefit obligation for our defined benefit pension plans was approximately $4.9 billion and $5.6 billion as of December 31, 2018, and December 31, 2017, respectively. The $130.8 million decrease in the net underfunded status of our aggregate pension and OPEB plans from December 31, 2017, to December 31, 2018, was primarily driven by the increase in discount rates. Our underfunded status also includes the impact of the High Court ruling in the U.K. related to equalizing pension benefits between men and women, which had an immaterial impact to our net underfunded status.