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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended												3 Months Ended		9 Months Ended
	Sep. 15, 2023	Jul. 01, 2023	Mar. 15, 2023	Sep. 30, 2023	Aug. 31, 2023	Jun. 30, 2023	Apr. 30, 2023	Mar. 31, 2023	Jan. 31, 2023	Oct. 31, 2022	Sep. 30, 2022	Jul. 31, 2022	Apr. 30, 2022	Mar. 31, 2022	Jan. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Cash dividends declared on common stock (in dollars per share)																$ 0.10	$ 0.10	$ 0.30	$ 0.30
Dividends paid to common shareholders																		$ 175.5	$ 175.5
Dividends paid to preferred shareholders																		33.2	26.8
Series B Preferred Stock
Cash dividends paid on preferred stock (in dollars per share)				$ 20.67700		$ 18.92463		$ 26.875			$ 26.875			$ 26.875
Dividends paid to preferred shareholders				$ 10.3		$ 9.5		$ 13.4			$ 13.4			$ 13.4
Series B Preferred Stock | London Interbank Offered Rate (LIBOR)
Preferred stock, basis spread on variable rate			2.539%
Series B Preferred Stock | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Preferred stock, basis spread on variable rate	2.539%
Preferred stock, basis spread on variable rate, tenor spread adjustment	0.26161%
Quarterly dividend
Cash dividends declared on common stock (in dollars per share)					$ 0.10
Cash dividends paid on common stock (in dollars per share)		$ 0.10					$ 0.10		$ 0.10	$ 0.10		$ 0.10	$ 0.10		$ 0.10
Dividends paid to common shareholders		$ 58.5					$ 58.5		$ 58.5	$ 58.5		$ 58.5	$ 58.5		$ 58.5
Common equities | Quarterly dividend
Common share dividends				$ 58.5							$ 58.5					$ 58.5	$ 58.5	$ 58.5	$ 58.5

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