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Change in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | $ 702.2 |  |
Fair value of plan assets at end of year | 625.8 | $ 702.2 |
Pension Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 824.0 | 717.6 |
Service cost | 2.6 | 3.6 | $ 2.9
Interest cost | 27.3 | 28.9 | 28.8
Plan amendments | 4.3 | 0.5 |
Actuarial loss (gain) | (63.2) | 28.1 |
Change in GM Portion of OPEB Obligation | 0.0 | 0.0 |
Participant contributions | 0.3 | 0.3 |
Curtailments | (11.6) | 0.0 |
Settlements | (0.6) | 14.3 |
Benefit payments | (39.7) | (40.8) |
MPG acquisition / business combination | 0.0 | 82.3 |
Currency fluctuations | (9.4) | 17.8 |
Other | 0.5 | 0.0 |
Net change | (89.5) | 106.4 |
Benefit obligation at end of year | 734.5 | 824.0 | 717.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 702.2 | 611.3 |
Actual return on plan assets | (31.0) | 74.9 |
Employer contributions | 4.4 | 4.4 |
Participant contributions | 0.3 | 0.3 |
Benefit payments | (39.8) | (40.8) |
Settlements | (0.6) | (14.3) |
MPG acquisition / business combination | 0.0 | 49.9 |
Currency fluctuations | (9.7) | 16.5 |
Net change | (76.4) | 90.9 |
Fair value of plan assets at end of year | 625.8 | 702.2 | 611.3
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 613.3 | 571.7 |
Service cost | 0.4 | 0.3 | 0.3
Interest cost | 12.4 | 13.3 | 14.0
Plan amendments | (2.3) | 0.0 |
Actuarial loss (gain) | (43.8) | 22.6 |
Change in GM Portion of OPEB Obligation | (32.6) | 16.5 |
Participant contributions | 0.0 | 0.0 |
Curtailments | (0.2) | 0.0 |
Settlements | 0.0 | 0.0 |
Benefit payments | (9.9) | (12.5) |
MPG acquisition / business combination | 0.0 | 1.4 |
Currency fluctuations | 0.0 | 0.0 |
Other | 0.0 | 0.0 |
Net change | (76.0) | 41.6 |
Benefit obligation at end of year | 537.3 | 613.3 | 571.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0.0 | 0.0 |
Actual return on plan assets | 0.0 | 0.0 |
Employer contributions | 9.9 | 12.5 |
Participant contributions | 0.0 | 0.0 |
Benefit payments | (9.9) | (12.5) |
Settlements | 0.0 | 0.0 |
MPG acquisition / business combination | 0.0 | 0.0 |
Currency fluctuations | 0.0 | 0.0 |
Net change | 0.0 | 0.0 |
Fair value of plan assets at end of year | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Change in the amount estimated to be received from General Motors Company (GM) that relates to an agreement between us and GM to share proportionally in the cost of other postretirement employee benefits for eligible retirees based on the length of service an employee had with us and GM. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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