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Employee Benefits - Deferred Comp Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Comp Plan
Period over which matching contributions vest after year 5	9 years
Deferred compensation expense	$ 4.7	$ 3.4	$ 2.4
Other liabilities
Deferred Comp Plan
Liabilities related to Deferred Comp Plan	13.2	8.8
Other assets
Deferred Comp Plan
Assets related to Deferred Comp Plan	$ 8.2	$ 5.9

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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-Publisher FASB
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- Definition

Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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