Segment Results (Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting [Abstract]
Total consolidated operating income	$ 113.3	$ 81.3	$ 255.2	$ 196.9
Interest expense	11.7	9.9	31.6	28.9
Other non-operating (income), net	(5.1)	(9.2)	(16.0)	(27.3)
Earnings from continuing operations before income taxes	$ 106.7	$ 80.6	$ 239.6	$ 195.3