Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Trading Securities

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