Related Parties (Details) - FS&C [Member] - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Trinity [Member]
Related Party Transaction [Line Items]
Investment expenses	$ 0.1	$ 0.2
Pension Plans [Member] \| Investment Management Services for Defined Benefit Plan [Member]
Related Party Transaction [Line Items]
Investment expenses	0.2	$ 0.2
Assets under Management, Carrying Amount	$ 160.1

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration