Net (loss) Income per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net (loss) income	$ (3.7)	$ 69.7
Denominator:
Weighted-average number of shares-basic (in shares)	50.7	53.3
Dilutive securities-equity awards (in shares)	0.0	1.2
Weighted-average number of shares-diluted (in shares)	50.7	54.5
Net income per share - basic (in dollars per share)	$ (0.07)	$ 1.31
Net income per share - diluted (in dollars per share)	$ (0.07)	$ 1.28
Antidilutive securities excluded from computation of earnings per share (in shares)	1.6	0.1