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LEASES - Lease Costs and Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
LEASES.
Operating lease costs	$ 7.4	$ 6.2
Weighted average remaining lease term (years)	10 years 8 months 12 days	11 years 10 months 24 days
Weighted average discount rate	3.10%	3.40%
Cash paid for amounts included in the measurement of lease liabilities	$ 5.3	$ 4.1
Right-of-use assets obtained in exchange for lease liabilities	$ 14.8	$ 1.0

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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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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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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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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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