Number of Classes of Preferred Stock

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

The amount per share used to calculated dividend payments on preferred stock.

+ References

No definition available.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

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- Definition

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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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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- Definition

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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No definition available.

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- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

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No definition available.

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- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

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- Definition

Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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

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Stockholders' Equity (Details)	12 Months Ended
Stockholders' Equity (Details)	Dec. 31, 2018 class $ / shares shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2018 $ / shares shares
Schedule of Capitalization, Equity [Line Items]
Number of classes of preferred stock \| class	2
Preferred stock, dividend rate	4.00%	4.00%
Stock
Shares reserved for issuance under stock plans, dividend reinvestment program and conversion of Preferred and Preference Stock				33,572,744
Preferred Stock
Schedule of Capitalization, Equity [Line Items]
Preferred stock, dividend rate	4.00%
Dividends (USD per share) \| $ / shares	$ 2
Shares issued upon conversion (shares)				24.24
Redemption price per share (USD per share) \| $ / shares				$ 50
Shares authorized to be issued (shares)				600,000
Shares outstanding (shares)	12	12		12
Stock
Shares outstanding (shares)	12
Shares outstanding (shares)	12	12
Preference Stock
Schedule of Capitalization, Equity [Line Items]
Dividends (USD per share) \| $ / shares	$ 2.12
Shares issued upon conversion (shares)				16.53
Redemption price per share (USD per share) \| $ / shares				$ 28
Shares authorized to be issued (shares)				5,000,000
Shares outstanding (shares)	16,301	16,301		14,635
Stock
Shares outstanding (shares)	16,301
Shares outstanding (shares)	14,635	16,301
Common Stock
Schedule of Capitalization, Equity [Line Items]
Shares outstanding (shares)	186,603,738	185,668,718	195,521,208	187,675,082
Stock
Shares outstanding (shares)	186,603,738	185,668,718	195,521,208
Repurchases of common stock			(10,633,235)
Issuance of common stock	1,043,809	881,480	767,060
Conversions to common stock	27,535	53,540	13,685
Shares outstanding (shares)	187,675,082	186,603,738	185,668,718
Treasury Stock
Schedule of Capitalization, Equity [Line Items]
Shares outstanding (shares)	136,734,174	137,669,194	127,816,704	135,662,830
Stock
Shares outstanding (shares)	136,734,174	137,669,194	127,816,704
Repurchases of common stock			(10,633,235)
Issuance of common stock	1,043,809	881,480	767,060
Conversions to common stock	27,535	53,540	13,685
Shares outstanding (shares)	135,662,830	136,734,174	137,669,194