Income Taxes - Tax Examination Status (Details)	12 Months Ended
Income Taxes - Tax Examination Status (Details)	Dec. 31, 2013
Internal Revenue Service (IRS) [Member] \| Minimum [Member]
Income Tax Examination [Line Items]
Income Tax Examintation, Year under Examiniation, In Negotiation for Final Resolution	2005
Income Tax Examination, Year under Examination	2010
Internal Revenue Service (IRS) [Member] \| Maximum [Member]
Income Tax Examination [Line Items]
Income Tax Examintation, Year under Examiniation, In Negotiation for Final Resolution	2009
Income Tax Examination, Year under Examination	2011
NEW YORK \| Minimum [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2004
NEW YORK \| Maximum [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2008
UNITED KINGDOM
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2012
Merrill Lynch [Member] \| Internal Revenue Service (IRS) [Member] \| Minimum [Member]
Income Tax Examination [Line Items]
Income Tax Examintation, Year under Examiniation, In Negotiation for Final Resolution	2004
Merrill Lynch [Member] \| Internal Revenue Service (IRS) [Member] \| Maximum [Member]
Income Tax Examination [Line Items]
Income Tax Examintation, Year under Examiniation, In Negotiation for Final Resolution	2008