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Fair Value Measurements (Financial Instruments Recorded at Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 193.8	$ 152.0
Cash and cash equivalents	193.8	152.0
Deferred compensation asset	3.2	2.4
Deferred compensation obligation	3.2	2.3
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	193.8	152.0
Deferred compensation asset	3.2	2.4
Deferred compensation obligation	3.2	2.3
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0.0	0.0
Deferred compensation asset	0.0	0.0
Deferred compensation obligation	0.0	0.0
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0.0	0.0
Deferred compensation asset	0.0	0.0
Deferred compensation obligation	$ 0.0	$ 0.0

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Fair value of obligations measured on a recurring basis.

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