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Employee Benefits - Defined Benefit Plan Termination (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Employee Benefits
Settlement loss	$ 19.4
Number of defined benefit plans \| item	1
Fair value of plan assets	$ 63.9	$ 107.1
Frozen Defined Benefit Plan
Employee Benefits
Settlement loss	$ 12.7

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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