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Employee Benefits - Defined Benefit Plan Termination (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Employee Benefits |  |
Fair value of plan assets | $ 107.1 | $ 94.9
Frozen Defined Benefit Plan |  |
Employee Benefits |  |
Projected benefit obligation | 49.8 |
Fair value of plan assets | 47.8 |
Defined benefit plan, Accumulated comprehensive loss | $ 16.3 |

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