Stock-Based Compensation Plans and Employee Benefits (Directors' Awards) (Details) (CSE and restricted stock units, USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended
Mar. 31, 2014 Directors	Dec. 31, 2013 Directors	Mar. 31, 2014 Former director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for settlement (in shares)			55,076
Non-vested, outstanding (in shares)	312,058
Aggregate intrinsic value for directors		$ 4.6

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant