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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 |  |

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