Equity Investments (Summary of Investment in Joint Venture, Balance Sheet Data) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 313.0	$ 356.5
Current liabilities	194.5	182.7
Non-current liabilities	886.1	969.5
WAVE [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Current assets	88.9	100.8
Non-current assets	87.2	86.3
Current liabilities	33.0	31.3
Non-current liabilities	$ 363.9	$ 372.3