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Shareholders' Equity (Narrative) (Details)																		1 Months Ended			12 Months Ended
	Sep. 30, 2021 $ / shares	Sep. 15, 2021 $ / shares	Jul. 12, 2021 USD ($) shares	Jun. 30, 2021 $ / shares	Jun. 15, 2021 $ / shares	Mar. 31, 2021 $ / shares	Mar. 15, 2021 $ / shares	Dec. 31, 2020 $ / shares shares	Sep. 30, 2020 $ / shares	Sep. 15, 2020 $ / shares	Jun. 30, 2020 $ / shares	Jun. 15, 2020 $ / shares	Jun. 05, 2020 USD ($) $ / shares shares	Mar. 31, 2020 $ / shares	Mar. 13, 2020 $ / shares	Mar. 22, 2019 shares	Jun. 27, 2013 USD ($) shares	Jun. 30, 2018 USD ($) $ / shares shares	May 31, 2013 $ / shares shares	Mar. 31, 2004 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) period director $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Aug. 11, 2021 USD ($)	Jul. 31, 2021 $ / shares	Jul. 28, 2021 USD ($)	Mar. 26, 2020 USD ($)
Class of Stock [Line Items]
Aggregate authorized shares (in shares) | shares																					325,000,000
Authorized common shares (in shares) | shares																					225,000,000
Authorized preference shares (in shares) | shares																					100,000,000
Par value (in usd per share)								$ 1.00													$ 1.00	$ 1.00
Preference shares, issued, value | $																					$ 488,653,000	$ 0	$ 0
Preference shares, shares outstanding (in shares) | shares								11,010,000													30,000	11,010,000
Dividends paid per common share (in usd per share)	$ 0.36			$ 0.36		$ 0.36
Dividends on preference shares | $																					$ 33,266,000	$ 30,923,000	36,756,000
Dividends on common shares | $																					$ 67,800,000	$ 68,500,000	$ 59,400,000
Common shares
Class of Stock [Line Items]
Preference shares, shares issued (in shares) | shares																					0	6,777,000	1,739,000
Share repurchase program, shares repurchased (in shares) | shares																					6,579,000	406,000	0
Repurchase of shares | $																					$ 6,579,000	$ 406,000	$ 0
TMR
Class of Stock [Line Items]
Shares issued (in shares) | shares																1,739,071
Common shares
Class of Stock [Line Items]
Proceeds from issuance of equity | $													$ 1,100,000,000
Dividends declared per common share (in usd per share)		$ 0.36			$ 0.36		$ 0.36			$ 0.36		$ 0.36			$ 0.36
Dividends paid per common share (in usd per share)								$ 0.36	$ 0.36		$ 0.36			$ 0.36
Share repurchase program, authorized aggregate amount | $																										$ 500,000,000
Share repurchase program, shares repurchased (in shares) | shares																					6,578,133
Repurchase of shares | $																					$ 1,000,000,000
Share repurchase program, price per share (in dollars per share)																					$ 156.78
Share repurchase program, remaining authorized amount | $																					$ 306,600,000
Common shares | Underwritten Follow-On Offering
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares													6,325,000
Sale of stock, price per share (in usd per share)													$ 166.00
Common shares | Private Placement
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares													451,807
Proceeds from issuance of equity | $													$ 75,000,000
Series F Preferred Stock
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares																		10,000
Proceeds from issuance of equity | $																		$ 250,000,000
Dividend rate, percentage																					5.75%
Par value (in usd per share)																					$ 1.00
Liquidation preference (in usd per share)																		$ 25,000
Liquidation preference per annum (in usd per share)																					1,437.5
Quarterly liquidation preference (in usd per share)																					359.375
Series F Preferred Stock | Debt Instrument, Redemption, Period One
Class of Stock [Line Items]
Redemption price per share (in usd per share)																					$ 25,000
Series G Preferred Stock
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares			20,000
Proceeds from issuance of equity | $			$ 500,000,000
Dividend rate, percentage																					4.20%
Liquidation preference (in usd per share)																									$ 25,000
Liquidation preference per annum (in usd per share)																					$ 1,050
Quarterly liquidation preference (in usd per share)																					262.50
Series G Preferred Stock | Debt Instrument, Redemption, Period One
Class of Stock [Line Items]
Redemption price per share (in usd per share)																					25,000
Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares			10,000
Depositary Shares, each representing a 1/1,000th interest in a Series G 4.20% Preference Share, Par Value $1.00 per share
Class of Stock [Line Items]
Sale of stock, number of shares issued (in shares) | shares			20,000,000
Depositary Shares
Class of Stock [Line Items]
Percentage interest in underlying shares																		0.10%							0.10%
Depositary Shares | Debt Instrument, Redemption, Period One
Class of Stock [Line Items]
Redemption price per share (in usd per share)																					$ 25.00
Series C Preferred Stock
Class of Stock [Line Items]
Dividend rate, percentage																					6.08%
Par value (in usd per share)																				$ 25
Preference shares, issued, value | $																				$ 250,000,000
Preference shares, shares issued (in shares) | shares																				10,000,000
Preference shares, shares redeemed (in shares) | shares																	5,000,000
Preference shares, redemption amount | $																	$ 125,000,000										$ 125,000,000
Preference shares, shares outstanding (in shares) | shares																					0
Right to elect directors, required number of dividend periods in arrears | period																					6
Right to elect directors, number of directors | director																					2
Liquidation preference per annum (in usd per share)																					$ 1.52
Quarterly liquidation preference (in usd per share)																					$ 0.38
Series E Preferred Stock
Class of Stock [Line Items]
Dividend rate, percentage																					5.375%
Par value (in usd per share)																			$ 25
Preference shares, shares issued (in shares) | shares																			11,000,000
Preference shares, redemption amount | $																								$ 275,000,000
Preference shares, shares outstanding (in shares) | shares																					0
Liquidation preference per annum (in usd per share)																					$ 1.34375
Quarterly liquidation preference (in usd per share)																					0.3359375
Series F Preferred Shares, Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in usd per share)																					1.4375
Quarterly liquidation preference (in usd per share)																					0.359375
Series G Preferred Shares, Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in usd per share)																					1.05
Quarterly liquidation preference (in usd per share)																					$ 0.2625

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