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Employee Benefit Plans - Narrative (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 20, 2018 USD ($) Employee | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Components of periodic benefit costs |  |  |  |  |
Other income (expense) - net |  | $ (5.7) | $ (3.1) | $ (8.6) | $ (4.0)
U.S. Pension Plans |  |  |  |  |
Components of periodic benefit costs |  |  |  |  |
Defined benefit plan obligation transfer | $ 18.6 |  |  |  |
Number of retirees and beneficiaries | Employee | 622 |  |  |  |
Pension Settlement Charge | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Components of periodic benefit costs |  |  |  |  |
Other income (expense) - net |  | $ (4.5) |  | $ (4.5) |
Pension Settlement Charge | Reclassification out of Accumulated Other Comprehensive Income | U.S. Pension Plans |  |  |  |  |
Components of periodic benefit costs |  |  |  |  |
Other income (expense) - net | $ 4.5 |  |  |  |

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