Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement, Additional Disclosure [Abstract]

Schedule of Stock-based Compensation Expense

The amounts of stock-based compensation expense as reflected in salaries and related expenses in our Consolidated Statements of Operations, and the related tax benefit, are listed below.

	Years ended December 31,
	2023		2022		2021
Stock-settled awards	$	27.8	$	26.3	$	36.7
Cash-settled awards	0.3		0.3		1.0
Performance-based awards	18.9		23.7		33.4
Stock Options	0.3		0.3		0.3
Employee stock purchase plan	2.9		3.1		2.1
Other 1	2.7		2.0		11.3
Stock-based compensation expense	$	52.9	$	55.7	$	84.8
Tax benefit	$	12.5	$	13.1	$	18.0

1Represents charges recorded for severance expense related to stock-based compensation awards.