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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting [Abstract]
Total consolidated operating income	$ 71.0	$ 59.3	$ 144.3	$ 134.6
Interest expense	9.0	11.3	43.4	33.9
Other non-operating expense		10.8		13.5
Other non-operating (income)	(1.6)		(8.9)	(5.4)
Earnings from continuing operations before income taxes	$ 63.6	$ 37.2	$ 109.8	$ 92.6