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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of cumulative cash dividends distributed to shareholders.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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The cumulative amount of offering costs allocated to the preferred partners.

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholder, which takes precedence over common stockholders in the event of liquidation and from issuance of rights to purchase common shares at a predetermined price.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Other Equity Matters (Details) - USD ($) $ / shares in Units, $ in Millions												1 Months Ended	3 Months Ended						9 Months Ended
	Sep. 10, 2020	Sep. 08, 2020	Jun. 11, 2020	Jun. 08, 2020	Mar. 12, 2020	Mar. 09, 2020	Sep. 09, 2019	Sep. 05, 2019	Jun. 10, 2019	Jun. 06, 2019	Mar. 12, 2019	Jan. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Apr. 21, 2020
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount																					$ 200.0
Treasury Stock, Value, Acquired, Including Commissions																			$ 107.2
Preferred Stock, Redemption Price Per Share													$ 25.00						$ 25.00
Dividends	$ 35.5		$ 35.8		$ 37.1			$ 37.6		$ 38.6	$ 40.4
Cash dividends paid per share	$ 0.52		$ 0.52		$ 0.52			$ 0.52		$ 0.52	$ 0.52		$ 0.52			$ 0.52			1.56	$ 1.56
Common Shares
Class of Stock [Line Items]
Treasury Stock Acquired, Average Cost Per Share																			$ 28.39
Stock Repurchase Program, Remaining Authorized Repurchase Amount													$ 153.2						$ 153.2
Preferred Shares
Class of Stock [Line Items]
Cumulative unpaid preferred dividends													$ 1.8						$ 1.8
8.50% Series A Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Dividends		$ 1.8		$ 1.8		$ 1.8	$ 1.8		$ 1.8
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.53125		$ 0.53125		$ 0.53125	$ 0.53125		$ 0.53125
8.00% Series B Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Dividends		$ 2.9		$ 2.9		$ 2.9	$ 2.6
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.50		$ 0.50		$ 0.50	$ 0.45
7.375% Series C Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Dividends		$ 3.2		$ 3.2		$ 3.2
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.46094		$ 0.46094		$ 0.46094
6.875% Series D Cumulative Redeemable Perpetual Preference Shares
Class of Stock [Line Items]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants												$ 145.3
Preferred Units, Offering Costs												$ 4.7
Dividends		$ 2.6		$ 2.6		$ 1.5
Preferred Stock, Dividends, Per Share, Cash Paid		$ 0.42969		$ 0.42969		$ 0.24
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired, shares													356,708	2,050,924	1,365,620	1,604,803	2,347,826	2,636,534	3,773,252