Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Summary of service-based share awards activity

Service-based share awards	Number
Outstanding at January 1, 2022	1,460,013
Granted	266,745
Vested	(739,800)
Forfeited	(247,602)
Outstanding at December 31, 2022	739,356
Performance-based share awards	Number
Outstanding at January 1, 2022	1,073,628
Granted	217,746
Vested	(291,466)
Forfeited	(555,852)
Outstanding at December 31, 2022	444,056

	Year ended December 31,
Service-based share awards	2022		2021		2020
Weighted average per share fair value of service-based share grants	$	17.30	$	9.97	$	7.50

Summary of share-based compensation expense

The following table summarizes the compensation cost recognized for the years ended December 31, 2022, 2021 and 2020 for all service-based and performance-based share awards. The compensation cost is included as part of selling, general and administrative expenses in our Consolidated Statements of Operations.

	Year ended December 31,
	2022		2021		2020
Share-based compensation (benefit) expense reported:
Performance-based share (benefit) expense	$	(5.0)	$	12.5	$	6.3
Service-based share expense	4.4		8.3		3.3
Total share-based compensation (benefit) expense before income tax	(0.6)		20.8		9.6
Income tax	—		—		—
Total share-based compensation (benefit) expense, net of income tax	$	(0.6)	$	20.8	$	9.6