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Leases - Lease Cost and Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lease costs:
Operating lease cost	$ 8.7	$ 11.5
Short-term and variable lease costs	0.5	0.7
Cash flows:
Operating cash flows from operating leases	$ 8.5	$ 11.5
Weighted average remaining lease term (in years)	6 years 10 months 24 days	5 years 10 months 24 days
Weighted average discount rate	3.30%	3.40%

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Short-Term And Variable Lease, Cost

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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-Name Accounting Standards Codification
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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