Earnings Per Share (Schedule of Earnings Per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent									$ 717.0	$ 902.0	$ 517.0
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic									65,800	66,300	66,900
Equivalent shares from outstanding stock options									1,100	800	800
Weighted Average Number of Shares Outstanding, Diluted									66,900	67,100	67,700
Basic earnings per share:
Basic earnings per share	$ 2.26	$ 2.37	$ 3.07	$ 3.20	$ 2.40	$ 4.34	$ 3.09	$ 3.77	$ 10.90	$ 13.60	$ 7.73
Diluted earnings per share	$ 2.22	$ 2.33	$ 3.03	$ 3.16	$ 2.37	$ 4.29	$ 3.05	$ 3.72	$ 10.73	$ 13.44	$ 7.64
Net Income	$ 150.0	$ 158.0	$ 204.0	$ 212.0	$ 160.0	$ 289.0	$ 207.0	$ 253.0	$ 724.0	$ 909.0	$ 521.0
Net income attributable to noncontrolling interest									$ 7.0	$ 7.0	$ 4.0