Earnings (Loss) per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Calculation of basic earnings (loss) per share:
Net income (loss) applicable to common stock	$ (17.4)	$ (26.8)	$ 94.4	$ (141.5)
Weighted-average common shares outstanding — basic (in shares)	149.0	152.1	150.6	152.0
Basic earnings (loss) per share (in dollars per share)	$ (0.12)	$ (0.18)	$ 0.63	$ (0.93)
Calculation of diluted earnings (loss) per share:
Net income (loss) applicable to common stock	$ (17.4)	$ (26.8)	$ 94.4	$ (141.5)
Convertible Notes	0.0	0.0	3.1	0.0
Diluted income (loss) applicable to common stock	$ (17.4)	$ (26.8)	$ 97.5	$ (141.5)
Weighted-average common shares outstanding — diluted (in shares)	149.0	152.1	164.7	152.0
Diluted earnings (loss) per share (in dollars per share)	$ (0.12)	$ (0.18)	$ 0.59	$ (0.93)
Convertible Notes
Calculation of diluted earnings (loss) per share:
Effective tax rate			21.00%
Common Stock, Non-Exchangeable
Calculation of basic earnings (loss) per share:
Weighted-average common shares outstanding — basic (in shares)	148.6	151.6	150.2	151.5
Common Stock, Exchangeable
Calculation of basic earnings (loss) per share:
Weighted-average common shares outstanding — basic (in shares)	0.4	0.5	0.4	0.5