Statement of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Dividends paid per common share (usd per share)	$ 0.10	$ 0.10	$ 0.30	$ 0.30
Retained Earnings [Member]
Cash Dividends Paid to Affiliates	$ 2.6	$ 2.6	$ 7.8	$ 7.8