Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income	$ 252.0	$ 197.0	$ 517.0	$ 1,170.0
Shares:
Weighted average outstanding shares	67	67
Equivalent shares from outstanding stock awards	1	1
Denominator for diluted calculation	68	68
Diluted earnings per share	$ 3.72	$ 2.91
Basic earnings per share	$ 3.77	$ 2.93
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1.0	$ 0.0	4.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 253.0	$ 197.0	$ 521.0