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Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions to benefit plans	$ 17.6	$ 19.4	$ 20.8
Parent Company
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions to benefit plans	$ 3.0	$ 3.6	$ 4.8

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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.

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No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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