Net income per share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Basic and Diluted Net Income per Share

The following table presents the calculation of basic and diluted net (loss) income per share:

	Three Months Ended March 31,
	2022		2021
Numerator:
Net (loss) income	$	(3.7)	$	69.7
Denominator:
Weighted-average number of shares—basic	50.7		53.3
Dilutive securities—equity awards	—		1.2
Weighted-average number of shares—diluted	50.7		54.5
Net (loss) income per share - basic	$	(0.07)	$	1.31
Net (loss) income per share - diluted	$	(0.07)	$	1.28

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the share-based awards that are not considered in the diluted net (loss) income per share calculation generally because the exercise price of the awards was greater than the average per share closing price during the three months ended March 31, 2022 and 2021. In certain instances, awards may be anti-dilutive even if the average market price exceeds the exercise price when the sum of the assumed proceeds exceeds the difference between the market price and the exercise price.

	Three Months Ended March 31,
	2022	2021
Anti-dilutive stock awards	1.6	0.1