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Employee Benefit Plans - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
SERPs
Defined Benefit Plan Disclosure [Line Items]
Contributions to benefit plan	$ 0.8
Estimated future contributions	0.6
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Contributions to benefit plan	24.1
Estimated future contributions	$ 0.0

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

+ References

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