Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary Of Activity Of The Allowance For Credit Losses For Accounts Receivable

The following table summarizes the activity of the ACL for Accounts receivable (in millions):

	December 31,
	2022		2021
Opening balance	$	7.1	$	8.1
Allowances	5.5		1.7
Net write-offs and other	(3.6)		(2.7)
Closing balance	$	9.0	$	7.1

Schedule Of Useful Lives Of Property and Equipment

The useful lives of property and equipment are as follows:

Description	Useful Life
Leasehold improvements	Lesser of estimated useful life or remaining lease term
Office furniture and equipment	Five years
Computer software and internally-developed software	Three years
Computer equipment	Three years