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Pension Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated benefit obligation | $ 92.4 | $ 81.4 |
Expected contributions, 2021 | 0.3 |  |
Expected defined benefit pension plan expense for 2021 | 5.4 |  |
Defined benefit pension plan expense | $ 4.9 |  |
Expected return on plan assets, lookback period | 10 years |  |
US Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined contribution plan expense | $ 7.3 | 13.5 | $ 12.8
Unfunded status of plans | 0.9 |  |
Future benefit payments, 2021 | 0.1 |  |
Future benefit payments, 2022 | 0.1 |  |
Future benefit payments, 2023 | 0.1 |  |
Future benefit payments, 2024 | 0.1 |  |
Future benefit payments, 2025 | 0.1 |  |
Future benefit payments, 2026-2030 | 0.3 |  |
Foreign Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined contribution plan expense | 2.1 | $ 2.8 | $ 3.7
Unfunded status of plans | 88.0 |  |
Future benefit payments, 2021 | 3.1 |  |
Future benefit payments, 2022 | 3.4 |  |
Future benefit payments, 2023 | 3.4 |  |
Future benefit payments, 2024 | 3.8 |  |
Future benefit payments, 2025 | 3.9 |  |
Future benefit payments, 2026-2030 | 25.3 |  |
Unfunded Plan | US Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Unfunded status of plans | 0.9 |  |
Unfunded Plan | Foreign Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Unfunded status of plans | $ 88.3 |  |

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