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Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 7.8	$ 7.2	$ 6.9
Share-based compensation	1.6	0.9	$ 0.5
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 1.5	$ 0.9

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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

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