Investments in Unconsolidated Affiliates (Summary of the Difference Between Carrying Amount and Underlying Equity of Equity Method Investment) (Details) - WAVE [Member] - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	$ 123.6	$ 127.9
Property, Plant and Equipment [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	0.4	0.4
Other Intangibles [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	92.8	97.1
Goodwill [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	$ 30.4	$ 30.4