Equity Investments (Summary of Investment in Joint Venture, Balance Sheet Data) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Current assets		$ 356.5	$ 321.9
Current liabilities		182.7	209.6
Other non-current liabilities		969.5	980.7
WAVE [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Current assets		100.8	119.7
Non-current assets	[1]	86.3	42.1
Current liabilities	[1]	31.3	37.1
Other non-current liabilities	[1]	$ 372.3	$ 297.4

[1] Includes initial ROU assets and lease liabilities of $29.4 million recognized upon adoption of Accounting Standards Codification Topic 842 – Leases on January 1, 2022.