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Earnings per Common Share - Textual (Details) - USD ($) $ / shares in Units, $ in Millions								3 Months Ended		6 Months Ended
	Jul. 23, 2019	Jul. 15, 2019	May 03, 2019	Apr. 15, 2019	Feb. 21, 2019	Jan. 15, 2019	Oct. 26, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Cash dividends per common share, Declared (in dollars per share)								$ 0.27	$ 0.25	$ 0.54	$ 0.50
Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Cash dividends per common share, Declared (in dollars per share)			$ 0.27		$ 0.27		$ 0.27
Cash dividends per common share, Paid (in dollars per share)				$ 0.27		$ 0.27
Common stock dividends accrued								$ 27.8		$ 27.8		$ 28.4
Subsequent Event [Member] | Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Cash dividends per common share, Declared (in dollars per share)	$ 0.28
Cash dividends per common share, Paid (in dollars per share)		$ 0.27

X

- Definition

Aggregate dividends paid 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)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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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

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 210.5-02.20)
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