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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Total consolidated operating income	$ 87.2	$ 66.0	$ 141.9	$ 115.6
Interest expense	9.5	9.8	19.9	19.0
Other non-operating (income), net	(5.4)	(9.1)	(10.9)	(18.1)
Earnings from continuing operations before income taxes	$ 83.1	$ 65.3	$ 132.9	$ 114.7