Condensed Consolidated Balance Sheets Parenthetical (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 19,378.2	$ 19,085.0
Equity securities, cost	107.7	107.4
Mortgage loans on real estate valuation allowance	1.0	1.1
Securities pledged, amortized costs	$ 217.1	$ 224.4
Common stock, par value	$ 50	$ 50
Common stock, shares authorized	100,000us-gaap_CommonStockSharesAuthorized	100,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	55,000us-gaap_CommonStockSharesIssued	55,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	55,000us-gaap_CommonStockSharesOutstanding	55,000us-gaap_CommonStockSharesOutstanding

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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Available-for-sale, Debt Securities, Excluding Securities Valued at Fair Value Option, Amortized Cost

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