Recoverable from Reinsurers (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Amount	$ 953.7	$ 1,000.2
Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	100.00%	100.00%
Hannover Life Reassurance Company of America \| A+
Ceded Credit Risk [Line Items]
Amount	$ 323.3	$ 336.9
Hannover Life Reassurance Company of America \| A+ \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	33.90%	33.70%
Munich American Reassurance Company \| A+
Ceded Credit Risk [Line Items]
Amount	$ 347.6	$ 335.0
Munich American Reassurance Company \| A+ \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	36.40%	33.50%
ManhattanLife Assurance Company of America \| B+
Ceded Credit Risk [Line Items]
Amount	$ 47.0	$ 89.5
ManhattanLife Assurance Company of America \| B+ \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	4.90%	8.90%
Loyal American Life Insurance Company \| A
Ceded Credit Risk [Line Items]
Amount	$ 147.5	$ 146.0
Loyal American Life Insurance Company \| A \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	15.50%	14.60%
Great American Life Insurance Company \| A
Ceded Credit Risk [Line Items]
Amount	$ 56.2	$ 54.5
Great American Life Insurance Company \| A \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	5.90%	5.40%
Other
Ceded Credit Risk [Line Items]
Amount	$ 32.1	$ 38.3
Other \| Percentage of Total, Reinsurance recoverable \| Reinsurer Concentration Risk
Ceded Credit Risk [Line Items]
Percentage of total	3.40%	3.90%
First Insurance Treaty
Ceded Credit Risk [Line Items]
Cash proceeds received		$ 161.4
Ceded reinsurance reduction		140.8
Gain recognized from recapture		20.6
Second Insurance Treaty
Ceded Credit Risk [Line Items]
Cash proceeds received		168.0
Ceded reinsurance reduction		141.7
Gain recognized from recapture		$ 26.3

Reinsurance Recoverable, Cash Proceeds Received

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- Definition

Reinsurance Recoverable, Ceded Reinsurance Reduction From Payment

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- Definition

Reinsurance Recoverable, Gain (Loss) Recognized From Recapture

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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