Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income (loss)	$ (134.5)	$ 343.2
Subtract:
Net income (loss) attributable to noncontrolling interest	5.6	4.5
Total net income (loss), basic	(140.1)	338.7
Total net income (loss), diluted	$ (140.1)	$ 338.7
Weighted-average shares outstanding:
Basic	243.4	259.4
Dilutive effects:
Diluted	243.4	263.8
Net income (loss) per common share:
Basic	$ (0.58)	$ 1.31
Diluted	$ (0.58)	$ 1.28
Nonqualified Stock Options
Dilutive effects:
Stock-based compensation awards		1.6
Restricted Stock Units
Dilutive effects:
Stock-based compensation awards		2.3
Performance Share Awards
Dilutive effects:
Stock-based compensation awards		0.5