Equity Method Investments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investments Net Gain (Loss) From Impairment and Reduction In Obligations	$ 5.7	$ 21.4	$ 7.0
Loss from equity method investments	$ 61.9	$ 48.4	$ 62.1
Clean energy investments
Schedule of Equity Method Investments [Line Items]
Number of equity method investments	3