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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 20, 2021 | Aug. 30, 2021 | Nov. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Oct. 14, 2021 | Sep. 30, 2021
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Term loan facilities |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,518.6
Revolving credit facilities |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 1,275.0
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.65 |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 200.0 |  |  |  |  |  |
Subsequent Event | Term loan facilities |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt, restructuring |  |  |  |  |  | $ (1,200.0) |
Subsequent Event | Unsecured Financing |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt, restructuring |  |  |  |  |  | 1,200.0 |
Subsequent Event | Senior Notes |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt, restructuring |  |  |  |  |  | (2,300.0) |
Subsequent Event | Unsecured |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt, restructuring |  |  |  |  |  | 2,300.0 |
Subsequent Event | Revolving credit facilities |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,000.0 |
8.50% Series A Cumulative Redeemable Perpetual Preference Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  | 8.50% |  |
8.50% Series A Cumulative Redeemable Perpetual Preference Shares | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 8.50% |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.5312500 |  |  |  |  |  |
8.00% Series B Cumulative Redeemable Perpetual Preference Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 8.00% |  |  |
8.00% Series B Cumulative Redeemable Perpetual Preference Shares | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 8.00% |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.5000000 |  |  |  |  |  |
7.375% Series C Cumulative Redeemable Perpetual Preference Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 7.375% |  |  |  |
7.375% Series C Cumulative Redeemable Perpetual Preference Shares | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 7.375% |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.4609375 |  |  |  |  |  |
6.875% Series D Cumulative Redeemable Perpetual Preference Shares | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 6.875% |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.4296875 |  |  |  |  |  |
5.75% Series E Cumulative Redeemable Perpetual Preference Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.75% |  |  |  |  |
5.75% Series E Cumulative Redeemable Perpetual Preference Shares | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.75% |  |  |  |  |  |
Dividend approved and declared (in dollars per share) | $ 0.3593750 |  |  |  |  |  |

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