Equity Investment (Summary of Investment in Joint Venture, Income Statement Data) (Details) - WAVE [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Net sales	$ 99.9	$ 93.1	$ 302.3	$ 287.5
Gross profit	56.9	50.8	168.4	160.2
Net earnings	$ 43.9	$ 38.7	$ 127.3	$ 123.5