Related Parties (Details) - FS&C [Member] - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Trinity [Member]
Related Party Transaction [Line Items]
Investment expenses		$ 0.1
Pension Plans [Member] \| Investment Management Services for Defined Benefit Plan [Member]
Related Party Transaction [Line Items]
Investment expenses	$ 0.3	0.3
Assets under Management, Carrying Amount		$ 146.6

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