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Other Equity Matters Dividend Payment (Details) - USD ($) $ / shares in Units, $ in Millions													3 Months Ended
	Dec. 03, 2019	Sep. 05, 2019	Jun. 06, 2019	Mar. 12, 2019	Dec. 03, 2018	Sep. 04, 2018	Jun. 01, 2018	Mar. 12, 2018	Dec. 01, 2017	Sep. 01, 2017	Jun. 01, 2017	Mar. 20, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Dividends Payable [Line Items]
Dividends	$ 37.3	$ 37.6	$ 38.6	$ 40.4	$ 41.0	$ 41.6	$ 41.6	$ 36.1	$ 36.0	$ 33.2	$ 33.2	$ 33.2
8.50% Series A Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Dividends													$ 1.8	$ 1.8	$ 1.8
Preferred Stock, Dividends, Per Share, Cash Paid													$ 0.53125	$ 0.53125	$ 0.53125
8.00% Series B Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Dividends													$ 2.9	$ 2.6
Preferred Stock, Dividends, Per Share, Cash Paid													$ 0.50000	$ 0.45000
7.375% Series C Cumulative Redeemable Perpetual Preference Shares
Dividends Payable [Line Items]
Dividends													$ 1.4
Preferred Stock, Dividends, Per Share, Cash Paid													$ 0.19462

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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