Equity Investment (Summary of Investment in Joint Venture, Income Statement Data) (Details) - WAVE [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Net sales	$ 104.0	$ 94.1	$ 197.9	$ 180.7
Gross profit	56.6	46.7	106.9	87.5
Net earnings	$ 43.0	$ 35.6	$ 82.2	$ 66.1