Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Equity Method Investments (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) investment	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) investment	Sep. 30, 2019 USD ($)	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investments summarized financial data basis			100.00%
Loss from equity method investments	$ 2.9	$ 10.4	$ 37.4	$ 43.6
Clean energy investments
Schedule of Equity Method Investments [Line Items]
Number of equity method investments	3		3		3
Gain on equity method investments	$ 15.0	$ 7.0