Segment Results (Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting [Abstract]
Total consolidated operating income	$ 87.0	$ 71.6	$ 157.2	$ 134.8
Interest expense	9.2	5.8	17.9	10.9
Other non-operating (income), net	(2.2)	(1.4)	(4.6)	(2.7)
Earnings before income taxes	$ 80.0	$ 67.2	$ 143.9	$ 126.6