Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Long-term investments
Cost Basis	$ 7.6	$ 11.0
Fair Value	24.6	34.3
Certificates of Deposit [Member]
Long-term investments
Fair Value	24.6	34.3
Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring
Long-term investments
Fair Value	24.6	34.3
Certificates of Deposit [Member]
Long-term investments
Unrealized Gain	0.0	0.0
Assets held in rabbi trusts
Long-term investments
Cost Basis	4.3	5.4
Unrealized Gain	0.1	1.6
Fair Value	$ 4.4	$ 7.0

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of unrealized gain (loss) on investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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