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
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-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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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	6 Months Ended
Investments (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Assets held in rabbi trusts [Member]
Short-term investments:
Fair value of assets held under trust	$ 5.1		$ 7.0
Long-term investments:
Assets held in a rabbi trust	4.9		5.4
Long-term investments, unrealized gain	0.2	$ 1.6
Certificates of deposit
Long-term investments:
Long-term investments, unrealized gain	0.0	$ 0.0
Certificates of Deposit, at Carrying Value	31.4		34.3
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	31.4		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	$ 31.4		$ 34.3