Investments

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

The Company's trading securities consist of the following:

(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value (Net Carrying Amount)
December 31, 2021
Trading equity securities	$	7.8	$	0.4	$	—	$	8.2
Trading debt securities	12.6		0.1		0.1		12.6
Total	$	20.4	$	0.5	$	0.1	$	20.8
December 31, 2020
Trading equity securities	$	6.4	$	0.6	$	—	$	7.0
Trading debt securities	10.8		0.3		0.1		11.0
Total	$	17.2	$	0.9	$	0.1	$	18.0

Trading equity investments are valued at their estimated fair value based on their quoted market prices, and trading debt securities are valued based upon a mix of observable market prices and model driven prices derived from a matrix of observable market prices for assets with similar characteristics obtained from a nationally recognized third-party pricing service. Additionally, a significant portion of the trading equity securities are in mutual funds and also comprise a portion of the Company's liability under its deferred compensation programs. See Note 14, Employee Benefit Plans, for additional information on these investments and the deferred compensation programs.

Trading debt securities are comprised mainly of marketable debt securities held by Astec Insurance. Astec Insurance has an investment strategy that focuses on providing regular and predictable interest income from a diversified portfolio of high-quality fixed income securities.