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.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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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, 2021	Jun. 30, 2020	Dec. 31, 2020
Assets held in rabbi trusts [Member]
Short-term investments:
Fair value of assets held under trust	$ 6.9		$ 6.6
Long-term investments:
Assets held in a rabbi trust	5.1		5.2
Long-term investments, unrealized gain	1.8	$ 1.4
Certificates of deposit
Short-term investments:
Investments, Cost Basis	8.1		37.2
Short-term investments, unrealized gain	0.0		0.0
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Short-term investments:
Fair value of assets held under trust	8.1		37.2
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	$ 8.1		$ 37.2