Series A Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 04, 2015
Series A Preferred Stock [Abstract]
Series A preferred shares, shares issued	866,900	820,000	820,000
Aggregate purchase price			$ 820.0
Stated Value Of Preferred Shares Per Share			$ 1,000
Direct Issuance Expenses	$ 26.0
Accrued Dividends	$ 3.0	$ 4.0
Liquidation preference per share	$ 1,000
Dividend rate	5.50%
Penalty dividend rate	8.00%
Conversion price per preferred share	$ 30.00
Conversion rate per preferred share	33.33
Financial instruments subject to redemption, settlement terms, maximum number of shares	29,000,000.0	27,400,000.0
Minimum volume weighted average price of common stock for conversion at the option of the Company	$ 54.00

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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 210.5-02.27(b))
-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 28
-Subparagraph b
-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant