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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended											3 Months Ended		9 Months Ended
	Jul. 31, 2024	Apr. 30, 2024	Feb. 28, 2024	Jan. 31, 2024	Oct. 31, 2023	Sep. 30, 2023	Jul. 31, 2023	Jun. 30, 2023	Apr. 30, 2023	Mar. 31, 2023	Jan. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Dividends paid to common shareholders														$ 615.1	$ 175.5
Cash dividends declared on common stock (in dollars per share)												$ 0.10	$ 0.10	$ 0.30	$ 0.30
Common share dividends						$ 58.5						$ 58.6	$ 58.5	$ 58.6	$ 58.5
Cash dividends paid on preferred stock (in dollars per share)			$ 15.688377			$ 20.67700		$ 18.92463		$ 26.875
Dividends paid to preferred shareholders			$ 7.8			$ 10.3		$ 9.5		$ 13.4				7.8	$ 33.2
R2023A
Cash dividends paid on common stock (in dollars per share)				$ 0.75
Dividends paid to common shareholders				$ 439.3
R2024Q3
Cash dividends declared on common stock (in dollars per share)												$ 0.10
Common share dividends												$ 58.6		$ 58.6
R2024Q2
Cash dividends paid on common stock (in dollars per share)	$ 0.10
Dividends paid to common shareholders	$ 58.6
R2024Q1
Cash dividends paid on common stock (in dollars per share)		$ 0.10
Dividends paid to common shareholders		$ 58.6
R2023Q4
Cash dividends paid on common stock (in dollars per share)				$ 0.10
Dividends paid to common shareholders				$ 58.6
R2023Q3
Cash dividends paid on common stock (in dollars per share)					$ 0.10
Dividends paid to common shareholders					$ 58.5
R2023Q2
Cash dividends paid on common stock (in dollars per share)							$ 0.10
Dividends paid to common shareholders							$ 58.5
R2023Q1
Cash dividends paid on common stock (in dollars per share)									$ 0.10
Dividends paid to common shareholders									$ 58.5
R2022Q4
Cash dividends paid on common stock (in dollars per share)											$ 0.10
Dividends paid to common shareholders											$ 58.5
Series B Preferred Stock
Preferred stock, liquidation preference per share (USD per share)																$ 1,000
Aggregate redemption amount																$ 507.8