Investments (Investments Pledged as Collateral) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fixed income securities pledged at carrying value	$ 61.8
Outstanding borrowing with the Federal Home Loan Bank of Indianapolis	58.0
Carrying value bonds on deposit with various State and Regulatory agencies	26.2
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	0.2
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	$ 22.3

Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant