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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended												3 Months Ended		9 Months Ended
	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Jan. 31, 2020	Oct. 31, 2019	Sep. 30, 2019	Jul. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Feb. 29, 2020	Dec. 31, 2019	Aug. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Common Stock, Dividends, Per Share, Declared													$ 0.10	$ 0.10	$ 0.30	$ 0.30
Quarterly dividend [Member]
Common Stock, Dividends, Per Share, Declared		$ 0.10
Common Stock, Dividends, Per Share, Cash Paid			$ 0.10	$ 0.10		$ 0.10	$ 0.10		$ 0.10	$ 0.10
Annual variable dividend
Common Stock, Dividends, Per Share, Cash Paid						$ 2.25						$ 2.5140
Series B Preferred Stock
Preferred Stock, Dividends, Per Share, Cash Paid	$ 26.875				$ 26.875			$ 26.875			$ 26.875
Dividends payable		$ 13.4										$ 13.4						$ 13.4		$ 13.4
Common equities | Quarterly dividend [Member]
Dividends payable	$ 58.6				$ 58.5			$ 58.5			$ 58.4		$ 58.6	$ 58.5	$ 58.6	$ 58.5	$ 58.5		$ 58.5		$ 58.4
Common equities | Annual variable dividend
Dividends payable																			$ 1,316.9			$ 1,467.9

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Aggregate dividends paid during the period for each share of common stock outstanding.

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