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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of Company's Financial Assets and (Liabilities) at Fair Value on Recurring Basis
The following table summarizes the basis used to measure the Company’s financial assets (liabilities) at fair value on a recurring basis in the balance sheets at September 30, 2022 and December 31, 2021:
 Basis of Fair Value Measurements
 Balance at September 30, 2022Level 1Level 2Level 3
Trading securities - mutual funds held in nonqualified SERP(1)
$7.1 $7.1 $— $— 
Available-for-sale securities - equities(2)
38.8 38.8 — — 
 Basis of Fair Value Measurements
 Balance at December 31, 2021Level 1Level 2Level 3
Trading securities - mutual funds held in nonqualified SERP(1)
$11.6 $11.6 $— $— 
Available-for-sale securities - equities(2)
45.3 45.3 — — 

(1) The Supplemental Executive Retirement Plan (“SERP”) investment assets are offset by a SERP liability which represents the Company’s obligation to distribute SERP funds to participants.
(2) At September 30, 2022 and December 31, 2021, the securities are included in Other current assets on the Company’s Condensed Consolidated Balance Sheets and are available for overnight cash settlement, if necessary, to fund current operations.