Earnings per Share - Schedule of Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Calculation of basic earnings (loss) per share:
Net income (loss) applicable to common stock	$ (724.8)	$ 123.0	$ (131.9)	$ 200.5
Weighted-average common shares outstanding - basic (in shares)	150.9	157.6	152.3	163.5
Basic earnings (loss) per share (in dollars per share)	$ (4.80)	$ 0.78	$ (0.87)	$ 1.23
Calculation of diluted earnings (loss) per share:
Net income (loss) applicable to common stock	$ (724.8)	$ 123.0	$ (131.9)	$ 200.5
Convertible Notes	0.0	1.8	0.0	5.4
Diluted income (loss) applicable to common stock	$ (724.8)	$ 124.8	$ (131.9)	$ 205.9
Weighted average common shares outstanding - diluted (in shares)	150.9	173.0	152.3	179.0
Diluted earnings (loss) per share (in dollars per share)	$ (4.80)	$ 0.72	$ (0.87)	$ 1.15
Effective tax rate	19.00%	226.70%	1698.90%	(62.90%)
Convertible Notes
Calculation of diluted earnings (loss) per share:
Effective tax rate		21.00%		21.00%
Common Stock, Non-Exchangeable
Calculation of basic earnings (loss) per share:
Weighted-average common shares outstanding - basic (in shares)	150.3	157.0	151.7	162.9
Common Stock, Exchangeable
Calculation of basic earnings (loss) per share:
Weighted-average common shares outstanding - basic (in shares)	0.6	0.6	0.6	0.6