(Loss) Earnings Per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
(Loss) Income from continuing operations, net of tax	$ (1,118.6)	$ (100.2)	$ 238.0
Income from discontinued operations, net of tax	0.0	0.0	5.1
(Loss) Income from continuing operations, net of tax	$ (1,118.6)	$ (100.2)	$ 243.1
Denominator:
Weighted-average common shares outstanding used in basic earnings per share (in shares)	172.2	166.9	162.9
Incremental common shares from:
Assumed exercise of dilutive options and vesting of dilutive restricted stock units and performance stock units (in shares)	0.0	0.0	3.2
Assumed conversion of 2025 Convertible Notes (in shares)	0.0	0.0	11.5
Weighted average common shares outstanding used in diluted earnings (loss) per share (in shares)	172.2	166.9	177.6
Earnings per share:
(Loss) earnings from continuing operations - basic (in USD per share)	$ (6.50)	$ (0.60)	$ 1.46
(Loss) earnings from continuing operations - diluted (in USD per share)	(6.50)	(0.60)	1.34
Earnings from discontinued operations - diluted (in USD per share)	0	0	0.03
Earnings from discontinued operations - basic (in USD per share)	0	0	0.03
Earnings (loss) - basic (in USD per share)	(6.50)	(0.60)	1.49
Earnings (loss) - diluted (in USD per share)	$ (6.50)	$ (0.60)	$ 1.37