Equity Investment (Summary of Investment in Joint Venture, Income Statement Data) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Net sales	$ 282.6	$ 251.9
Gross profit	102.2	87.5
Net earnings	44.4	35.4
WAVE [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Net sales	110.4	98.6
Gross profit	54.8	58.9
Net earnings	$ 38.2	$ 44.6

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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