Equity Method Investments (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments summarized financial data basis			100.00%
Loss from equity method investments	$ 17.2	$ 16.2	$ 34.5	$ 33.2
Clean energy investments
Schedule of Equity Method Investments [Line Items]
Number of equity method investments	3		3