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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Total consolidated operating income	$ 78.3	$ 62.4	$ 132.4	$ 138.4
Interest expense	5.6	5.9	11.3	12.6
Other non-operating (income) expense, net	(1.6)	(4.4)	(2.9)	365.0
Earnings (loss) from continuing operations before income taxes	$ 74.3	$ 60.9	$ 124.0	$ (239.2)