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Common Stock and Related Matters - Dividends Declared And Or Paid (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Dividends Payable [Line Items]
Accrued preferred dividends payable date						Aug. 13, 2021
Dividends Declared per Share of Common Stock		$ 0.10			$ 0.10	$ 0.20	$ 1.01
Dividend Declared [Member]
Dividends Payable [Line Items]
Accrued preferred dividends payable date		Aug. 16, 2021	May 14, 2021	Feb. 16, 2021
Total Common Dividends Declared		$ 23.3	$ 23.3	$ 23.3
Amount of Common Dividends Paid or To Be Paid		22.9	22.9	22.9
Accrued Dividends	[1]	$ 0.4	$ 0.4	$ 0.4		$ 0.4
Dividends Declared per Share of Common Stock		$ 0.10000	$ 0.10000	$ 0.10000
[1] Represents accrued dividends on restricted stock and restricted stock units that are payable upon vesting.

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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-Topic 505
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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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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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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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