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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Net sales	$ 102.6	$ 103.5	$ 300.5	$ 284.2
Gross profit	54.0	53.4	160.9	140.9
Net earnings	$ 41.8	$ 42.3	$ 124.0	$ 108.4