Equity-based Compensation (Equity Plan) (Narrative) (Details) - Equity Plan [Member] shares in Millions	3 Months Ended
Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum authorized amount as a percentage of shares authorized	10.00%
Shares available for future issuance (shares)	85.0
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative Restricted share awards (shares)	4.2
Cumulative Restricted share awards forfeited (shares)	3.5
Cumulative Restricted Stock Units (shares)	3.6
Cumulative Restricted Stock Units forfeited (shares)	0.4
Cumulative Deferred Stock Units (shares)	0.1
Shares issued in period (shares)	7.9

Aggregate number of common shares reserved for future issuance.

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 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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