Summary of Significant Accounting Policies - Goodwill and Indefinite-Lived Intangibles (Details)	12 Months Ended
Dec. 31, 2014 number
Annual Goodwill Impairment Assessment [Abstract]
Number of reporting units	12us-gaap_NumberOfReportingUnits
Number of Reportable Segments	6us-gaap_NumberOfReportableSegments
Number of reporting units that have goodwill	10

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Reporting Unit

-URI http://asc.fasb.org/extlink&oid=6523643

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration