Variable Interest Entities (Details) (Variable Interest Entity, Primary Beneficiary [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013
New Ocean Capital Management Ltd [Member]
Variable Interest Entity [Line Items]
Non-controlling interest in consolidated subsidiaries	$ 0.3
New Ocean Focus Cat Fund [Member]
Variable Interest Entity [Line Items]
Non-controlling interest in consolidated subsidiaries	6.9
Total assets of consolidated entity	$ 23.5

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant