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Other Equity Matters Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
8.50% Series A Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Per Share Payment (in dollars per share)	$ 0.53	$ 0.53	$ 1.59	$ 1.59
Dividends	$ 1.8	$ 1.8	$ 5.4	$ 5.4
8.00% Series B Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Per Share Payment (in dollars per share)	$ 0.50	$ 0.50	$ 1.50	$ 1.50
Dividends	$ 2.9	$ 2.9	$ 8.7	$ 8.7
7.375% Series C Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Per Share Payment (in dollars per share)	$ 0.46	$ 0.46	$ 1.38	$ 1.38
Dividends	$ 3.2	$ 3.2	$ 9.6	$ 9.6
6.875% Series D Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Per Share Payment (in dollars per share)	$ 0.43	$ 0.43	$ 1.29	$ 1.29
Dividends	$ 2.6	$ 2.6	$ 7.8	$ 7.8
5.75% Series E Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Per Share Payment (in dollars per share)	$ 0.36	$ 0.36	$ 1.08	$ 1.08
Dividends	$ 2.5	$ 2.5	$ 7.6	$ 7.6
Preferred Shares
Dividends Payable [Line Items]
Dividends	$ 13.0	$ 13.0	$ 39.1	$ 39.1

X

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481071/942-405-45-2

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