Segment Results (Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting [Abstract]
Total consolidated operating income	$ 63.2	$ 54.1
Interest expense	5.1	5.7
Other non-operating (income), net	(1.3)	(1.3)
Earnings from continuing operations before income taxes	$ 59.4	$ 49.7