Aggregate reduction to income

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- Definition

Common Share Closing Price Percent of Preferred Share Prevailing Conversion Price, Minimum

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- Definition

Common Shares, Quarterly Dividend Per Share Threshold, Minimum

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- Definition

Preferred share quarterly dividend.

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No definition available.

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- Definition

Preferred Shares, Convertible, Conversion Price

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No definition available.

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- Definition

Preferred Shares, Convertible, Conversion Rate

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No definition available.

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- Definition

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

+ References

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

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph d

-Article 4

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(d)(1))

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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.

+ References

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

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- Definition

The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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Common and Preferred Shares Preferred Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 22, 2006	Dec. 31, 2014	Dec. 31, 2013	May 25, 2007	Dec. 31, 2012	Apr. 02, 2008	Oct. 12, 2012	Nov. 05, 2012
Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued	5,400,000	5,400,000	5,400,000
Preferred share dividend percentage	5.75%	5.75%
Proceeds from issuance of convertible preferred stock	$ 130.8
Preferred share dividend rate (in dollars per share)		$ 1.4375
Per share liquidation preference		$ 25
Preferred shares conversion rate		$ 0.3700
Preferred shares conversion price		$ 67.57
Common shares quarterly dividend per share threshold, minimum		$ 0.6875
Common share closing price percent of preferred share prevailing conversion price, minimum		135.00%
Preferred Shares declared dividends per share		$ 1.4375	$ 1.4375
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1.4375
Series D Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued				4,600,000
Preferred share dividend percentage				7.375%
Redemption price								$ 25.18
Per share liquidation preference								$ 25.00
Prorated quarterly dividend rate								$ 0.4609375
Aggregate reduction to income					3.9
Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued		3,450,000	3,450,000			3,500,000
Preferred share dividend percentage		9.00%				9.00%
Proceeds from issuance of convertible preferred stock						83.4
Preferred share dividend rate (in dollars per share)		$ 2.25
Per share liquidation preference		$ 25
Preferred shares conversion rate		$ 0.4551
Preferred shares conversion price		$ 54.93
Common shares quarterly dividend per share threshold, minimum		$ 0.84
Common share closing price percent of preferred share prevailing conversion price, minimum		150.00%
Preferred Shares declared dividends per share			$ 2.25
Preferred Stock, Dividends, Per Share, Cash Paid		$ 2.25
Series F Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued							5,000,000
Preferred share dividend percentage		6.625%					6.625%
Proceeds from issuance of convertible preferred stock							$ 120.6
Preferred share dividend rate (in dollars per share)		$ 1.65625
Per share liquidation preference		$ 25.00
Preferred Shares declared dividends per share		$ 1.65625	$ 1.65625
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1.65625	$ 1.67006