The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 210
-SubTopic 10
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+ References

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-Publisher FASB
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Amount of unrealized gain (loss) on investment.

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-SubTopic 10
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Investments (Details) - USD ($) $ in Millions	9 Months Ended
Investments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Assets held in rabbi trusts [Member]
Short-term investments:
Fair value of assets held under trust	$ 4.5		$ 7.0
Long-term investments:
Assets held in a rabbi trust	4.5		5.4
Long-term investments, unrealized gain		$ 1.6
Certificates of deposit
Long-term investments:
Long-term investments, unrealized gain	0.0	$ 0.0
Certificates of Deposit, at Carrying Value	14.6		34.3
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	14.6		34.3
Short-term investments \| Certificates of deposit \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	$ 14.6		$ 34.3