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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Amortized Cost of Fixed Maturity Securities $ 5,076.0 $ 5,021.6
Long-term Debt, Fair Value $ 963.7 $ 614.6
Common Stock, Par Value (usd per share) $ 0.1 $ 0.1
Common Stock, Shares Authorized 100,000,000 100,000,000
Common Stock, Shares Issued 51,558,608 51,462,405
Common Stock, Shares, Outstanding 51,558,608 51,462,405