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Benefit Plans, Fair Values by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Weighted average asset allocations value [Abstract]
Fair value of plan assets	$ 358.2	$ 340.0
Equity Securities [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	200.0	187.5
Fixed Income Securities [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	99.7	98.8
Real Estate [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	1.0	0.9
Other [Member]
Weighted average asset allocations value [Abstract]
Fair value of plan assets	$ 57.5	$ 52.8

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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