Segment Results (Reconciliation of Total Segment Operating Income To Earnings Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting [Abstract]
Total segment operating income	$ 117.2	$ 111.3	$ 338.9	$ 292.4
Interest expense	8.2	10.5	25.3	30.6
Other non-operating (income), net	(0.5)	(3.0)	(1.9)	(9.3)
Earnings before income taxes	$ 109.5	$ 103.8	$ 315.5	$ 271.1