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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 12, 2021 | Jun. 05, 2020 | Jul. 19, 2021 | Jun. 30, 2021 | Aug. 11, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |  |  |  |
Preference shares, par value (in dollars per share) |  |  |  | $ 1.00 |  | $ 1.00
Preference shares, shares outstanding (in shares) |  |  |  | 11,010,000 |  | 11,010,000
Common Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Share repurchase program, shares repurchased (in shares) |  |  |  | 3,019,603 |  |
Repurchase of shares |  |  |  | $ 480.7 |  |
Share repurchase program, price per share (in dollars per share) |  |  |  | $ 159.18 |  |
Proceeds from issuance |  | $ 1,100.0 |  |  |  |
Series G Preferred Stock |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividend rate, percentage |  |  |  | 4.20% |  |
Series E Preference Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividend rate, percentage |  |  |  | 5.375% |  |
Liquidation preference per annum (in dollars per share) |  |  |  | $ 1.34375 |  |
Series E Preference Shares | Forecast |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Preference shares, shares outstanding (in shares) |  |  |  |  | 0 |
Preference shares redemption value |  |  |  |  | $ 275.0 |
Subsequent Event | Common Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Share repurchase program, shares repurchased (in shares) |  |  | 920,000 |  |  |
Repurchase of shares |  |  | $ 137.5 |  |  |
Share repurchase program, price per share (in dollars per share) |  |  | $ 149.57 |  |  |
Subsequent Event | Depositary Shares, each representing a 1/1,000th interest in a Series G 4 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Shares issued (in shares) | 20,000,000 |  |  |  |  |
Liquidation preference per annum (in dollars per share) | $ 25.00 |  |  |  |  |
Proceeds from issuance | $ 500.0 |  |  |  |  |
Subsequent Event | Series G Preferred Stock |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Preference shares, par value (in dollars per share) | $ 1.00 |  |  |  |  |
Liquidation preference per annum (in dollars per share) | $ 25,000 |  |  |  |  |
Subsequent Event | Series E Preference Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Preference shares, shares outstanding (in shares) | 11,000,000 |  |  |  |  |

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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21564-112644 + Details
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