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Investments - Schedule of Maturities of Fixed Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Amortized Cost	$ 3,637.5
Fair Value
Total	3,812.6	$ 3,391.6
Corporate, Municipal, U.S. Government and Other securities
Amortized Cost
Due in one year or less	28.9
Due after one year through five years	233.6
Due after five years through ten years	337.8
Due after ten years	2,320.1
Subtotal	2,920.4
Fair Value
Due in one year or less	29.6
Due after one year through five years	238.8
Due after five years through ten years	354.5
Due after ten years	2,477.0
Subtotal	3,099.9
Mortgage-backed securities
Amortized Cost
Amortized cost, without single maturity date	179.9
Fair Value
Fair value, without single maturity date	186.5
Asset-backed securities
Amortized Cost
Amortized cost, without single maturity date	537.2
Amortized Cost	537.2	540.8
Fair Value
Fair value, without single maturity date	526.2
Total	$ 526.2	$ 511.5

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