Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Committments and Contingencies Unfunded Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Change in state insurance guaranty fund	$ 0.1	$ 0.1	$ 0.1
Limited partnerships \| Other Assets [Member]
Other Commitments [Line Items]
Other Commitment	56.6
Private Placement [Member] \| Fixed Maturities
Other Commitments [Line Items]
Other Commitment	$ 11.0