Equity Investments (Summary of Investment in Joint Venture, Income Statement Data) (Details) - WAVE [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Net sales	$ 393.7	$ 374.4	$ 392.5
Gross profit	208.7	187.4	185.1
Net earnings	$ 158.9	$ 144.4	$ 142.2