Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Long-term investments
Cost Basis	$ 11.0	$ 10.3
Fair Value	34.3	37.2
Certificates of Deposit [Member]
Long-term investments
Fair Value	34.3	37.2
Certificates of Deposit [Member] \| Fair Value, Measurements, Recurring
Long-term investments
Fair Value	34.3	37.2
Certificates of Deposit [Member]
Long-term investments
Unrealized Gain	0.0	0.0
Assets held in rabbi trusts
Long-term investments
Cost Basis	5.4	5.2
Unrealized Gain	1.6	1.4
Fair Value	$ 7.0	$ 6.6

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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-Publisher FASB
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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